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Cite as: [2015] WLR(D) 75, [2016] 1 WLR 1785, [2017] ICR 42, [2015] IRLR 289, [2015] ICR 931, [2016] 2 All ER 136, [2015] EWCA Civ 32

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		Neutral Citation Number: [2015] EWCA Civ 32
		Case No: A2/2013/3061

IN THE COURT OF APPEAL (CIVIL DIVISION)
ON APPEAL FROM EMPLOYMENT APPEAL TRIBUNAL
The Hon. Mr Justice Langstaff, President
UKEAT/0403/12/GE , [2013] UKEAT 0403_12_0410

Royal Courts of Justice
Strand, London, WC2A 2LL

5th February 2015

B e f o r e :

LORD DYSON, MASTER OF THE ROLLS
LADY JUSTICE ARDEN
and
LORD JUSTICE LLOYD JONES
____________________

Between:

	Ms C Reyes and Ms T Suryadi	Appellants
	- and -
	Mr J Al-Malki and Mrs Al-Malki	Respondents
	Secretary of State for Foreign and Commonwealth Affairs Kalayaan 4A Law	1st Intervener 2nd Intervener 3rd Intervener

____________________

(Transcript of the Handed Down Judgment of
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____________________

Mr Timothy Otty QC and Mr Paul Luckhurst (instructed by ATLEU at Islington Law Centre) for the Appellants
Sir Daniel Bethlehem QC and Mr Sudhanshu Swaroop (instructed by Reynolds Porter Chamberlain LLP) for the Respondents
Mr Tim Eicke QC and Ms Jessica Wells (instructed by The Treasury Solicitor) for the 1st Intervener
Dr Tom Hickman (instructed by Deighton Pierce Glynn) for the 2nd Intervener
Mr Arfan Khan and Mr Tahir Ashraf (instructed by 4A Law) for the 3rd Intervener
Hearing dates: 24th-27th November 2014
____________________

HTML VERSION OF JUDGMENT
____________________

Master of the Rolls:

In 2011, the claimants were employed as domestic workers by the respondents, a Saudi diplomatic agent and his wife. The claimants worked at the first respondent's official diplomatic residence. The UK Visas and Immigration ("UKV1"), which is a division of the Home Office, has determined that both women are the victims of trafficking. The respondents have now left the UK.

Ms Reyes (who is a Philippine national) worked for the respondents from the date of her arrival in the UK on 11 January 2011 until 14 March 2011, when she left with the assistance of the police. The respondents then replaced Ms Reyes with Ms Suryadi (who is an Indonesian national). She worked for the respondents from the date of her arrival in the UK on 16 May 2011 until 19 September 2011, when she left the residence whilst Mr Al-Malki was away and Mrs Al-Malki was asleep.

Both claimants made claims to the Employment Tribunal ("ET") alleging, inter alia, that they had suffered racial discrimination and harassment, and had been paid less than the national minimum wage. The proceedings were served by post on the respondents' solicitors and by post to their private residence. The respondents claimed diplomatic immunity pursuant to articles 31 and 37 of the Vienna Convention on Diplomatic Relations ("the 1961 Convention") which is incorporated into English law by virtue of section 2 of the Diplomatic Privileges Act 1964 ("the 1964 Act").

Article 31(1)(c) of the 1961 Convention lies at the heart of this appeal. It provides:

"A diplomatic agent shall….enjoy immunity from the receiving State's civil and administrative jurisdiction, except in the case of:

…

(c) an action relating to any professional or commercial activity exercised by the diplomatic agent in the receiving State outside his official functions."

Four issues arise on this appeal. These are: (i) whether, applying the principles of interpretation set out in the Vienna Convention on the Law of Treaties 1969 ("the VCLT"), a contract of employment entered into by a serving diplomatic agent with a domestic worker is to be characterised as "commercial activity exercised by the diplomatic agent in the receiving State outside his official functions" and is therefore within the exception to diplomatic immunity contained in article 31(1)(c) of the 1961 Convention; (ii) if not, whether granting a serving diplomat immunity in respect of a claim under a contract of employment with a domestic worker in accordance with article 31(1) of the 1961 Convention constitutes a breach of article 6 of the European Convention on Human Rights ("the ECHR"); and (iii) whether, on the assumption that Ms Reyes is able to prove that she was trafficked, granting immunity to a serving diplomat constitutes a breach of article 4 of the ECHR; and (iv) whether, regardless of the issue of immunity, a diplomat also has immunity from formal service of proceedings.

The claimants were successful before the ET. Judge Lewis held that "the exception under art 31(1)(c) of the Vienna Convention, read consistently with art 6 of the European Convention on Human Rights, applied". On appeal to the Employment Appeal Tribunal ("EAT"), Langstaff J (President) upheld the claim to immunity. He held first that the activity of employing a domestic worker was not within the scope of the Mr Al-Malki's official functions as a diplomat (the claimant having conceded for the purposes of the appeal to the EAT that this was not a "commercial activity"). Secondly, the assertion of diplomatic immunity in the present case was not in breach of article 6 of the ECHR. Thirdly, the ET's jurisdiction, being statutory, did not extend to the investigation of trafficking and therefore the claim based on article 4 of the ECHR would be rejected. Fourthly, he held that service had been validly effected: by post on the respondents' solicitors, who were already acting for them, and/or by post to the respondents' residence.

Ms Reyes appeals against the EAT's decision, seeking a restoration of the ET's finding that "the first and second respondents do not have diplomatic immunity from the claims". The respondents cross-appeal against the decision on the issue of service. Ms Suryadi had ceased to take part in the appeal by the time of the hearing.

Article 31(1)(c) of the 1961 Convention

Mr Otty QC submits that the proceedings fall with the scope of article 31(1)(c) of the 1961 Convention. There are several strands to his argument. First (and at its most basic level), he says that a contract of employment by a diplomatic agent of a person to provide domestic services is "commercial activity". He also (and separately) says that it is activity "outside [the diplomatic agent's] official functions". Secondly, and in any event, he says that a contract to employ such a person where he or she is the victim of trafficking is a "commercial activity outside his official functions". He submits that both of these conclusions are reached by giving the language of article 31(1)(c) its natural and ordinary meaning, taking account of other material provisions of the 1961 Convention to which I shall refer later. Thirdly, he submits that this interpretation is supported by (i) the common law principle that statutes (in this case, the 1964 Act) are to be interpreted in a manner which is consistent with the United Kingdom's obligations in international law; (ii) the statutory interpretative obligation imposed by section 3 of the Human Rights Act 1998 ("the HRA") by reference to articles 4 and 6 of the ECHR that, so far as it is possible to do so, primary legislation "must be read and given effect in a way which is compatible with the [ECHR] rights"; (iii) the statutory interpretative obligation flowing as a matter of European Union law from section 2(1) of the European Communities Act and article 47 of the Charter of Fundamental Rights of the European Union ("the Charter"); and (iv) a proper application of the interpretative principles set out in the Vienna Convention on the Law of Treaties ("VCLT").

I prefer to start with the question of whether, on a proper application of the interpretative principles set out in the VCLT, an ordinary contract of employment between a diplomat and a domestic worker for the provision of domestic services at the diplomat's official residence is a "commercial activity" without reference to any other principles of interpretation. By "ordinary contract of employment", I mean a contract which is not infected by trafficking.

Article 31 of the VCLT provides, so far as material:

"1. A treaty shall be interpreted in good faith in accordance with the ordinary meaning to be given to the terms of the treaty in their context and in the light of its object and purpose."

Ordinary meaning

I shall start with ordinary meaning. The first instance decision of Laws J in Propend Finance Pty Ltd v Sing (1997) 111 ILR 611 is the only domestic authority to have addressed the meaning of "commercial activity" in article 31(1)(c). Laws J referred to article 42 of the 1961 Convention which provides:

"A diplomatic agent shall not in the receiving State practise for personal profit any professional or commercial activity."

He said (at p.635) that the phrase "professional or commercial activity" means the same in article 42 as in article 31(1)(c) and continued:

"….the phrase refers to activity which might be carried on by the diplomat on his own account for profit; such "professional" activity would arise, for example, in the perhaps unlikely event that the diplomat was a qualified doctor who engaged in some medical practice during his tour of duty".

He added that the very rationale of article 31(1)(c) is to ensure that no immunity enures for the benefit of a diplomat where for one reason or another his activities do not comply with the article 42 prohibition.

This approach has been adopted in the United States where the leading authority is Tabion v Mufti 73F. 3d, 535 (4^th Cir, 1996), 107 ILR 452 (United States). In that case, the appellant worked as a domestic servant in the home of the respondent diplomats. The appellant brought proceedings claiming damages for breach of the terms of her contract of employment. The court held that the commercial activity exception to diplomatic immunity under article 31(1)(c) did not apply. Mr Otty submits that Tabion is of little assistance as an authority outside the United States because (i) the US State Department indicated in a "statement of interest" that "commercial activity" "focuses on the pursuit of trade or business activity; it does not encompass contractual relationships for goods or services incidental to the daily life of the diplomat and his family in the receiving state"; and (ii) "substantial deference" is due to the State Department's conclusion. But it is important to note that the court went on to say (with apparent approval) that "legal commentators similarly characterise the exception as covering only a diplomat's participation in trade or business, and not his everyday transactions". The court also cited with approval the views (to similar effect) of Eileen Denza in Diplomatic Law: Commentary on the Vienna Convention on Diplomatic Relations (1976) and concluded:

"It is evident from the foregoing authorities that the phrase 'commercial activity', as it appears in the Article 31(1)(c) exception, was intended by the signatories to mean 'commercial activity exercised by the diplomatic agent in the receiving State outside his official functions'. Day-to-day living services such as dry cleaning or domestic help were not meant to be treated as outside a diplomat's official functions. Because these services are incidental to daily life, diplomats are to be immune from disputes arising out of them."

This meaning of article 31(1)(c) has the support of Eileen Denza's Diplomatic Law (3^rd ed 2009) at p 305. I do not, therefore, accept that the authority of the decision in Tabion (which reflects US jurisprudence) can be brushed aside in the way that Mr Otty suggests. It is true that the court said that substantial deference was due to the State Department's conclusion. But as the court said, it was a view shared by legal commentators. In my view, it is correct. I would hold that, as a matter of ordinary language, a contract for the provision of services which are incidental to family or domestic daily life is not "commercial activity".

Context

The ordinary meaning of the words is consistent with the picture which emerges from a consideration of the scheme of the 1961 Convention as a whole. Other relevant provisions of the Convention include the following. Article 34 provides:

"A diplomatic agent shall be exempt from all dues and taxes, personal or real, national, regional or municipal, except:

…….

(d) dues and taxes on private income having its source in the receiving State and capital taxes on investments made in commercial undertakings in the receiving State."

This provision is illustrative of the principle which underlies diplomatic immunity. If a diplomatic agent does what he is sent to the receiving State to do, then the activities which are incidental to his life as a diplomatic agent are covered by the immunity. Private income and capital receipts from private investments made by the diplomatic agent in the receiving State are not the fruits of activities which are incidental to the life of a diplomatic agent: they are extraneous to it. Article 34 does, however, provide immunity from taxes payable by virtue of the diplomatic agent's activities as a diplomatic agent. Thus if the diplomatic agent does in the receiving State what he is sent by the sending State to do, what he does (including activities which are incidental to diplomatic life) is covered by immunity. But if he embarks on a private activity for profit, he becomes subject to the jurisdiction of the receiving State in relation to that activity. The use of the same words in article 31(1)(c) and article 42 shows that there is a clear link between the two provisions. The link is that, if the diplomatic agent acts in breach of article 42, he will not enjoy the immunity that article 31(1)(c) would otherwise afford him.

I have set out article 42 at para 11 above. I agree with what Laws J said about it in Propend. The use of the same phrase "professional or commercial activity" as appears in article 31(1)(c) is significant. Mr Otty submits that article 42 does not support the respondents' construction because article 31(1)(c) would be superfluous if it merely dovetailed with article 42 and it is unlikely that article 31(1)(c) was intended to be no more than a policing mechanism for article 42. It seems to me, however, to be entirely plausible that article 31(1)(c) and article 42 should have been intended to complement each other. As for the alleged superfluity, arguments based on surplusage rarely have much weight. In any event, as the respondents point out, article 31(1)(c) also exists to exclude immunity in situations not covered by article 42 where a diplomatic agent's family practises a profession or commercial activity.

The fourth recital to the 1961 Convention explains that "the purpose of [the immunities conferred] is not to benefit individuals but to ensure the efficient performance of the functions of diplomatic missions as representing States". These functions are listed in article 3(1) of the 1961 Convention as follows:

"(a) Representing the sending State in the receiving State;

(b) protecting in the receiving State the interests of the sending State and of its nationals, within the limits permitted by international law;

(c) negotiating with the Government of the receiving State;

(d) ascertaining by all lawful means conditions and developments in the receiving State, and reporting thereon to the Government of the sending State;

(e) promoting friendly relations between the sending State and the receiving State, and developing their economic, cultural and scientific relations".

The employment of individuals to provide domestic services in a diplomatic mission or an official diplomatic residence in the receiving State is conducive to the performance of diplomatic functions. It is not an action relating to any "commercial activity" undertaken for the financial benefit of the diplomatic agent; still less is it an action relating to any commercial activity "outside his official functions".

Object and purpose

It is also clear from the drafting history of article 31(1)(c) that this provision was only intended to apply to situations where the diplomatic agent, his family or other members of the mission carried out activities for personal profit, rather than covering ordinary contracts incidental to diplomatic life in the receiving State. This is illustrated by a number of extracts from the travaux preparatoires. In 1958, the commentary on the International Law Commission Draft Articles on Diplomatic Intercourse and Immunities ("ILC") records:

"The third exception arises in the case of proceedings relating to a professional or commercial activity exercised by the diplomatic agent outside his official functions. It was urged that activities of these kinds are normally wholly inconsistent with the position of a diplomatic agent, and that one possible consequence of his engaging in them might be that he would be declared persona non grata. Nevertheless, such cases may occur and should be provided for, and if they do occur, the persons with whom the diplomatic agent has had commercial or professional relations cannot be deprived of their ordinary remedies."

I accept the submission of Mr Eicke QC that the act of engaging domestic staff for the diplomatic agent's official residence was not within the contemplation of the ILC in drafting this provision: such an act could not sensibly be described as "wholly inconsistent with the position of a diplomatic agent" or an act which was likely to lead to the diplomatic agent being declared persona non grata.

I also accept his submission that the representations made at the 1961 Vienna Conference confirm that the prohibition on "professional and commercial activities" imposed by article 42 (which was not included in the ILC Draft Articles but was introduced as an additional provision at the Vienna Conference) was directed at commercial activity for personal profit. The new provision was proposed by the Colombian delegation, who submitted that the incompatibility between the performance of diplomatic functions and the exercise of a liberal profession or commercial activities was "universally admitted, but it was nevertheless essential to state it explicitly in the Convention". The suggested addition was widely approved. For example, the representative of Venezuela commented that "the exercise of gainful outside activities by a diplomatic officer would be detrimental to the dignity of his office"; and the representative of Ceylon noted that the proposed new article was directed at "a regular professional activity from which a permanent income was derived, and not an occasional activity, particularly of a cultural character."

Furthermore, the comments made in respect of article 29(1)(c) (which became article 31(1)(c)) and the proposed new article 42 illustrate that the two articles were closely inter-related. Thus (i) Colombia proposed deleting article 29(1)(c), as a corollary of inserting the new article 42; (ii) the Guatemalan delegate agreed with this proposed deletion, commenting that "…a diplomatic agent should devote himself exclusively to his diplomatic functions. Paragraph 1(c) as it stood might be interpreted as an implicit authorisation for the diplomatic agent to engage in a professional or commercial activity in the receiving State"; (iii) the Japanese representative supported the proposed addition of article 42, but pointed out that article 29(1)(c) was still necessary as it "applied not to diplomatic agents only, but also applied, in virtue of article 36 [now article 37] to members of a diplomatic agent's family forming part of his household and to the administrative and technical staff of the mission".

Moreover, the Yugoslav delegate expressly noted that he would have been inclined to add other exceptions to the immunity granted by article 29 (as it then was), particularly "actions arising out of an employment agreement relating to a locally employed servant of a foreign diplomatic mission". But this suggestion was not adopted.

It is therefore clear that the participants in the Vienna Conference (i) did not consider that contracts of employment for the provision of domestic services at a mission were already included within the concept of "professional and commercial activities"; and (ii) did not favour enlarging the scope of the exception to a diplomatic agent's immunity to include such contracts of employment.

Mr Otty (supported by the written submissions for the intervener, Kalayaan) submits that any person who is employed for remuneration is engaged in commercial activity, since he or she provides services for profit; and since the arrangement is one of mutual benefit for employer and employee, the employer is also engaged in commercial activity. He relies on the decision of the Supreme Court of Canada in Re Labour Code [1992] 2 SCR 50 in which it was held that the employment of workers is a commercial activity. That case concerned workers who were employed at a US military base as tradesmen and firefighters. Section 5 of the Canadian State Immunity Act SC 1980 provides an exception to state immunity for proceedings that "relate to any commercial activity of the foreign state". La Forest J said (at pp 79-80) that "a bare contract for employment services at the base is, in and of itself, generally a commercial activity" and that employment by foreign states is generally to be regarded as a commercial activity carried out by the foreign state. Mr Otty submits that this reasoning was not influenced by the context of state (rather than diplomatic) immunity. But this was a decision on Canadian legislation concerned with state immunity. In my view, it is of limited relevance to the interpretation of a treaty on diplomatic immunity. Its reasoning is insufficient to outweigh the combined effect of the points that I have set out at paras 11 to 25 above.

Mr Otty also relies on Fonseca v Larren, Portugal Supreme Court, 30 January 1991, which held that article 31(1)(c) of the 1961 Convention is apt to allow claims to be brought by domestic workers against a serving diplomatic agent. The court said in relation to article 31:

"it was intended to exclude all activities outside of the diplomat's diplomatic functions and amongst these is the contracting of a domestic maid to perform services in the diplomat's private residence."

But there is no analysis in support of this assertion, and I am unable to agree with it.

Finally, Mr Otty relies on the US decision in Park v Shin 313 F.3d 1138 (9^th Cir 2002). In that case, the plaintiff brought proceedings in respect of claims arising from her employment as a personal domestic servant at the Korean Consulate in San Francisco. The Foreign Sovereign Immunities Act provides that a foreign state shall not be immune from the jurisdiction of the courts of the United States in any case "in which the action is based upon a commercial activity carried on in the United States by the foreign state". There is a line of US authority to the effect that "an activity is commercial unless it is one that only a sovereign state could perform" (para 32 of the judgment). The court held that, since the hiring of a domestic servant is not an inherently public act that only a government could perform, the defendants were not entitled to sovereign immunity. But this is not a decision on the 1961 Convention. I would decline to follow it for the same reasons as I have given for not following the Canadian decision in Re Labour Code.

I cannot accept the broad interpretation of "commercial activity" for which Mr Otty contends. It has little support in the jurisprudence or the commentaries. It would frustrate the principle of reciprocity and importance of diplomatic immunity. It would mean that there was no diplomatic immunity in respect of any contract made between a diplomatic agent and another person for the supply by that other person of goods or services for profit. Moreover, as Sir Daniel Bethlehem QC points out, effect has also to be given to the important words "outside his official functions" in article 31(1)(c) of the 1961 Convention. There is no immunity in the case of an action relating to "any professional or commercial activity exercised….outside his official functions". The employment of a domestic servant at a mission is an activity which is incidental to the daily life of a diplomatic agent and enables him to perform his official functions.

I conclude, therefore, that article 31(1)(c) does not deprive a diplomatic agent of immunity from civil suit by a person employed at his official residence to carry out domestic services where the contract is not infected by any allegation of trafficking. The next question is whether a contract of employment which is otherwise not a commercial activity is rendered a commercial activity because the employee has been the subject of trafficking.

The trafficking dimension

As I have said, the UKVI has determined that both claimants are the victims of trafficking. In the case of Ms Reyes, it concluded that there was movement from one place to another (the Philippines to the UK) for the purposes of exploitation (domestic servitude) and that there was deception as to her pay. The 10 indicators of trafficking identified by the UKVI in Ms Reyes' case are pleaded in her claim form. Mr Otty submits that these proceedings relate to trafficking, although he accepts that trafficking claims as such do not fall within the jurisdiction of the ET (and on appeal to the EAT). In summary, his argument is as follows. Ms Reyes has been determined by the UKVI to be a victim of trafficking and the ET and EAT proceeded on the assumed basis that the allegations in her pleaded case were true. The accepted international definition of trafficking was set out by Lord Wilson in Hounga v Allen [2014] 1 WLR 2889 at para 37:

"The accepted international definition of trafficking is contained in the UN Protocol to Prevent, Suppress and Punish Trafficking in Persons ("the Palermo Protocol") signed in 2000 and ratified by the UK on 9 February 2006. Article 3 provides:

'(a) 'Trafficking in persons' shall mean the recruitment, transportation, transfer, harbouring or receipt of persons, by means of the threat or use of force or other forms of coercion, of abduction, of fraud, of deception, of the abuse of power or of a position of vulnerability… for the purpose of exploitation. Exploitation shall include, at a minimum, … sexual exploitation, forced labour or services, slavery or practices similar to slavery, servitude or the removal of organs;

(b) The consent of a victim of trafficking in persons to the intended exploitation set forth in subparagraph (a) of this article shall be irrelevant where any of the means set forth in subparagraph (a) have been used;

(c) The recruitment, transportation, transfer, harbouring or receipt of a child for the purpose of exploitation shall be considered 'trafficking in persons' even if this does not involve any of the means set forth in subparagraph (a) of this article'."

A threshold question arises as to whether the claims are based on an allegation of trafficking. The respondents say that the pleaded claims (for example, for direct and indirect racial discrimination) are not based on an allegation of trafficking. I am prepared to proceed on the basis that this is no impediment to considering whether the claimant can rely on the alleged trafficking to defeat the defence of immunity. In Hounga, the Supreme Court (by a majority) held that claims of discrimination relating to acts of trafficking were sufficiently closely connected to trafficking to require the remedial protections for victims of trafficking specified in the Council of Europe's Anti-Trafficking Convention ("ATC"): per Lord Wilson at para 50. There is force in the submission of Mr Otty that it would be an overly technical approach to contend that, since the formal causes of action relied on by Ms Reyes lie in the field of employment law, her claims do not relate to trafficking.

Ordinary language

Before I consider the various interpretative principles relied on by Mr Otty (supported by Kalayaan), I need to address the submission that, as a matter of ordinary language, engagement by a diplomatic agent in an employment relationship which meets the international definition of trafficking can constitute commercial activity on the part of the diplomatic agent. Mr Otty submits that trafficking has, by virtue of its economically exploitative aspect, an inherently commercial nature. He says that the phrase "commercial activity" is, as a matter of ordinary language, wide enough to embrace an employment relationship at least, where the elements of that relationship meet the international definition of trafficking. The Modern Slavery Bill Evidence Review Panel noted that the "fast growing modern slavery and human trafficking trade" is worth at least US$ 32 billion a year and is the second or third most profitable of all illicit trades. Mr Otty submits that the engagement of a diplomatic agent in an employment relationship which meets the international definition of trafficking meets the definition of commercial activity even if the definition is considered to require some element of profit motive.

Even if the claims relate to trafficking, the question remains whether such claims relate to a commercial activity outside the respondents' diplomatic functions. I shall assume that Kalayaan are right when they say that (i) intermediaries, from informal labour brokers to registered employment agencies, generate vast profits both from employers and from migrant workers themselves; and (ii) employers benefit financially by paying sub-market wages, demanding unlawful working hours and by levying charges and withholding benefits to which workers are legally entitled. But these features of the trafficking industry do not shed light on the question whether a particular diplomatic agent who employs a particular trafficked employee to carry out domestic services at a mission is engaging in a commercial activity within the meaning of article 31(1)(c), still less whether he is doing so outside his official functions. In my judgment, it is clear that, as a matter of ordinary language, he is not doing so. The fact that an employer derives economic benefit from paying his employee wages that are lower than the market rate does not mean that he is engaging in a commercial activity. Still less does it mean that he is engaging in an activity outside his official functions. As a matter of ordinary language, the question whether an employer is engaged in commercial activity when employing an individual depends on what the individual is employed to do, and not the rate of remuneration which he or she is paid for doing it or the background circumstances which led to the contract of employment in the first place. I should add that, if the position were otherwise, there would be considerable uncertainty as to the scope of the exception to immunity provided by article 31(1)(c). On this footing, whether an action relates to commercial activity might involve a difficult fact-finding exercise as to the terms of the contract of employment and the background events which led to the making of the contract. It would be surprising if the parties to the 1961 Convention had intended that article 31(1)(c) should generate such an inquiry.

Human trafficking in international law

I turn now to consider the submissions of Mr Otty (again supported by Kalayaan) that article 31(1)(c) should be construed in the light of the high status of the prohibition on human trafficking in international law and the incompatibility of engagement in such practices with the proper discharge of diplomatic functions. He says that, given the international law context of the exception to civil immunity at issue in this appeal, it is important to recognise the gravity with which international law regards human trafficking.

164 of the 193 members of the United Nations (including the UK and Saudi Arabia) are parties to the Protocol to Prevent, Suppress and Punish Trafficking in Persons, Especially Women and Children 2000 ("the Palermo Protocol"). The purposes of the Palermo Protocol include:

"(a) To prevent and combat trafficking in persons, paying particular attention to women and children;

(b) To protect and assist the victims of such trafficking, with full respect for their human rights".

Article 6 provides:

"6. Each State Party shall ensure that its domestic legal system contains measures that offer victims of trafficking in persons the possibility of obtaining compensation for damage suffered."

Trafficking is widely recognised as a contemporary form of slavery or a slavery-like practice: see, for example, paras 30 and 62 of the report of the Office of the United Nations Commissioner for Human Rights on "abolishing Slavery and its Contemporary Forms" (2002). Article 5 of the EU Charter of Fundamental Rights ("the Charter") under the heading "Prohibition of slavery and forced labour" provides: "(3) Trafficking in human beings is prohibited".

In Rantsev v Cyprus and Russia (2010) 51 EHRR 1, the ECtHR had to consider a complaint of a violation, inter alia, of article 4 of the ECHR which provides:

"1. No one shall be held in slavery or servitude.

2. No one shall be required to perform forced or compulsory labour."

At para 282, the court said:

"There can be no doubt that trafficking threatens the human dignity and fundamental freedoms of its victims and cannot be considered compatible with a democratic society and the values expounded in the Convention. In view of its obligation to interpret the convention in light of present-day conditions, the court considers it unnecessary to identify whether the treatment about which the applicant complains constitutes 'slavery', 'servitude; or 'forced and compulsory labour'. Instead, the Court concludes that trafficking itself, within the meaning of art.3(a) of the Palermo Protocol and art.4(a) of the Anti-Trafficking Convention, falls within the scope of art.4 of the Convention. The Russian Government's objection of incompatibility ratione materiae is accordingly dismissed."

Article 15(3) of the ATC provides: "Each Party shall provide, in its internal law, for the right of victims to compensation from the perpetrators".

Mr Otty submits that, against this background, it must follow that involvement by a diplomat in trafficking would be contrary to, and inconsistent with, the proper discharge of diplomatic functions and would be sufficient to justify treating the diplomat as persona non grata pursuant to article 9 of the 1961 Convention. He submits that international law requires "commercial activity" to be construed so as to include the employment of a victim of trafficking to provide domestic services at a diplomatic mission. He says that this construction is required (i) by the common law route of interpreting domestic law (article 31(1)(c) of the 1961 Convention which has been incorporated into our domestic law by the 1964 Act) in accordance with the UK's international obligations; (ii) by applying section 3 of the HRA with particular reference to articles 4 and 6 of the ECHR; and (iii) by applying the Charter. Since it is accepted that arguments by reference to the Charter add nothing to the arguments by reference to the ECHR, I shall say no more about the Charter.

Common law interpretation

Mr Otty relies on the well-established principle that there is a strong presumption in favour of interpreting English law (whether common law or statute) in a way which does not place the UK in breach of an international obligation. This principle was applied in Hounga at paras 50 to 52. Mr Otty submits that article 15(3) of the ATC would be breached by the adoption of a narrow meaning of the term "commercial activity" so as to bar Ms Reyes' claims. Barring these claims would also lead to a breach of article 6(6) of the Palermo Protocol.

The respondents counter this by saying that the court is being asked to construe the words of an international treaty as enacted in UK law and accordingly should seek to adopt a meaning that accords with international practice (and should not adopt a national or regional meaning): see Fothergill v Monarch Airlines Ltd [1981] AC 251, 281A-283D. The court should, therefore, apply international rules of treaty interpretation (as contained in articles 31 and 32 of VCLT) rather than domestic canons of construction.

As we have seen, article 15(3) of the ATC requires each Contracting State to provide in its internal law for the right of victims to compensation from the perpetrators. By contrast, article 6(6) of the Palermo Protocol merely requires a legal system which contains measures that offer victims "the possibility of obtaining compensation for damage suffered". It does not prescribe the means by which such possibility may be offered. For example, a criminal injuries compensation scheme would appear to suffice. (See, generally, Hounga v. Allen per Lord Hughes JSC at [65].)

I reject the submission that common law rules of statutory interpretation are relevant in the context of this appeal. Article 31(1)(c) must be interpreted in accordance with the VCLT like any other international treaty. Resort to domestic law principles of statutory interpretation of international instruments is inappropriate here. Furthermore, I am in any event unable to see how article 15(3) of the ATC or article 6(6) of the Palermo Protocol could, by means of a common law principle of interpretation, lead to the conclusion for which Mr. Otty contends. These provisions of the ATC and the Palermo Protocol do not address diplomatic immunity which is the specific subject matter of the 1961 Convention and the 1964 Act.

Section 3 of the HRA: articles 4 and 6 of the ECHR

Article 4

Mr Otty relies on Rantsev for the proposition that article 4 of the Convention requires Member States to take positive steps to protect victims of trafficking outside the framework of criminal investigations and prosecutions (paras 200 to 202). At para 285, the court identified the positive obligations inherent in article 4 as being (i) to penalise and prosecute "any act aimed at maintaining a person in a situation of slavery, servitude or forced or compulsory labour", (ii) "to put in place a legislative and administrative framework to prohibit and punish trafficking". The court referred to both the Palermo Protocol and the ATC and said:

"It is clear from the provisions of these two instruments that the contracting states, including almost all of the Member States of the Council of Europe, have formed the view that only a combination of measures addressing all three aspects can be effective in the fight against trafficking."

Basing himself on this passage, Mr Otty submits that these positive obligations would be breached in three respects if the claim of Ms Reyes were to be barred by reason of article 31(1)(c) of the 1961 Convention.

The first respect in which there would be a breach is in relation to the right to compensation vouchsafed by article 15(3) of the ATC. He submits that, given the ECtHR's endorsement of the requirements of the ATC as being a necessary part of the positive obligation to prevent trafficking, protect victims and punish traffickers, a failure to fulfil the obligation under article 15(3) (which is an essential part of that framework) would breach article 4 of the ECHR.

The second respect in which there would be a breach is in relation to the "positive obligation to put in place an appropriate legislative and administrative framework" to give practical and effective protection against trafficking and exploitation. The barring of an entire class of employment claims by domestic workers, namely claims against persons asserting diplomatic immunity, would represent a severe weakness in the legislative and administrative framework in the UK that failed effectively to discourage trafficking. Mr Otty submits that the EAT erred in holding (paras 53 and 56) that the UK's positive obligation was met by the criminalisation of slavery, servitude and forced or compulsory labour. As was stated at para 285 in Rantsev, the duty to penalise and prosecute trafficking is only one aspect of the Member States' general undertaking to combat trafficking.

The third respect in which there would be a breach is in relation to the obligation to provide for an effective investigation. The availability of civil proceedings may in some circumstances be the only way in which the investigative obligation can be discharged. In the present case, the Saudi authorities have refused to waive immunity to allow a police investigation to proceed.

I reject these submissions essentially for the reasons given by the respondents. The fundamental point is that article 4 of the ECHR (like article 6 to which I shall come) must be interpreted in accordance with the principles of international law, including the principles of diplomatic immunity contained in the 1961 Convention. In Rantsev itself, the court affirmed that "….the Convention should so far as possible be interpreted in harmony with other rules of international law of which it forms part" (para 274). On that basis, it concluded that trafficking as defined by the Palermo Protocol and the ATC was within the scope of article 4 of the Convention, even though article 4 does not specifically mention trafficking (para 282).

But Rantsev was not concerned with issues of diplomatic immunity. Mr Otty must establish the existence of a superior rule of international law which entails an exception to the principle of diplomatic immunity. The important decision of Jones v Saudi Arabia [2007] 1 AC 270 is illuminating in this regard. The claimants alleged that they had been tortured while imprisoned in Saudi Arabia and claimed damages for psychological injury. The defendants claimed state immunity. It was held by the House of Lords inter alia that Part I of the State Immunity Act 1978 was not disproportionate as being inconsistent with a peremptory norm or ius cogens of international law and its application did not infringe the claimants' rights under article 6 of the ECHR (assuming it to apply). The claims to state immunity were, therefore, upheld.

At para 14, Lord Bingham said:

"Thirdly, the claimants must show that the restriction is not directed to a legitimate objective and is disproportionate. They seek to do so by submitting that the grant of immunity to the Kingdom on behalf of itself or its servants would be inconsistent with a peremptory norm of international law, a jus cogens applicable erga omnes and superior in effect to other rules of international law, which requires that the practice of torture should be suppressed and the victims of torture compensated."

Although the prohibition of torture is a jus cogens, it was held that it did not take precedence over another rule of international law, namely state immunity. The House reached this conclusion by examining various sources of international law. Lord Bingham relied inter alia on the UN Immunity Convention of 2004 as being "the most authoritative statement available on the current international understanding of the limits of state immunity in civil cases" and said that "the absence of a torture or jus cogens exception is wholly inimical to the claimants' contention" (para 26).

Lord Hoffmann examined the relevant sources of international law at paras 44 to 63 in some detail. As he said (para 45), to produce a conflict with state immunity, it is necessary to show that the prohibition on torture has generated an ancillary procedural rule which, by way of exception to state immunity, entitles or requires states to assume civil jurisdiction over other states in cases in which torture is alleged. Having considered various treaties and judicial decisions of international and national courts, Lord Hoffmann concluded that the claimants had not established that the prohibition of torture was a peremptory norm or jus cogens which takes precedence over other rules of international law, including the rules of state immunity. Accordingly, the claimants were barred from pursuing their claims for compensation under the UN Convention against Torture and other Cruel, Inhuman or Degrading Treatment or Punishment 1984. In adopting this approach, the House of Lords were considering all the "normal" sources of international law as set out in the Statute of the International Court of Justice, including treaties, international custom, the general principles of law recognised by civilised nationals, judicial decisions and the teachings of publicists.

Mr Otty accepts that the prohibition on trafficking is not a peremptory norm or jus cogens. Nevertheless, he submits that it is a prohibition of "high status" sufficient amongst the norms of international law to qualify or displace an obligation to grant procedural immunity in a range of civil suits.

It would be remarkable if a prohibition which is a peremptory norm were not recognised in international law as sufficient to displace a procedural immunity, but a prohibition which is not a peremptory norm were recognised in international law as sufficient to have that effect. It is difficult to think of any rational basis for such a distinction.

However, as the respondents submit, the relevant question is not the status of the international prohibition of trafficking. It is whether this rule (which I am prepared to accept is correctly described as a rule of international law) takes precedence over the international rule of diplomatic immunity (subject to the exceptions contained in article 31(1)(c) of the 1961 Convention). There has been no attempt to establish the existence of a rule which has that effect by reference to the relevant sources of international law or at all.

At most, the ATC and the Palermo Protocol contain provisions on compensation for trafficking (articles 15(3) and 6(6) respectively). But there is no indication that these provisions are norms which entail an exception to diplomatic immunity. Mr Otty has not cited any material from any of the other recognised sources of international law. This is significant. As Lord Bingham said in Jones at para 27:

"Fourthly, there is no evidence that states have recognised or given effect to an international law obligation to exercise universal jurisdiction over claims arising from alleged breaches of peremptory norms of international law, nor is there any consensus of judicial and learned opinion that they should. This is significant, since these are sources of international law. But this lack of evidence is not neutral: since the rule on immunity is well-understood and established, and no relevant exception is generally accepted, the rule prevails."

So too Lord Hoffmann at para 63:

"But the same approach cannot be adopted in international law, which is based upon the common consent of nations. It is not for a national court to 'develop' international law by unilaterally adopting a version of that law which, however desirable, forward-looking and reflective of values it may be, is simply not accepted by other states. (See Al-Adsani 34 EHRR 273, 297, para O-II9 in the concurring opinion of judges Pellonpää and Bratza)."

Mr Otty submits that the ECtHR has repeatedly emphasised the obligation to construe an ambiguous international measure in a manner that best secures compliance with fundamental rights (which in this case he submits would include the various positive obligations under article 4 of the ECHR). He relies, for example, on the decision in Al-Dulimi and Montana Management Inc v Switzerland (Appl No. 5809/08, 26 November 2013). The rights in issue in that case included article 6 of the ECHR. The applicants alleged that there had been a violation of the right of access to a court to challenge the merits of a decision to freeze and confiscate their assets. The court found that there had been a violation despite the fact that Switzerland was under a clear international obligation, pursuant to article 25 of the UN Charter, to implement the terms of a Security Council resolution requiring the applicants' assets to be frozen in this manner. At para 112, the court said:

"…the Convention cannot be interpreted in a vacuum but must be interpreted in harmony with the general principles of international law. Account should be taken, as indicated in Article 31(1)(c) of the Vienna Convention on the Law of Treaties of 1969, of 'any relevant rules of international law applicable in the relations between the parties, and in particular the rules concerning the international protection of human rights'".

The court then went on to make its findings in the light of the particular context of the international obligations arising from the state's membership of an international organisation (the UN). Mr Otty submits that, since fundamental rights must take precedence over an unambiguous UN Security Council resolution, the ambiguous terms of article 31(1)(c) of the 1961 Convention must be subordinated to the UK's obligations under the ECHR. The other authorities to which Mr Otty refers are Al-Jedda (2011) 53 EHRR 23 and Nada v Switzerland (2013) 56 EHRR 18. In the former, the right in issue was article 5 of the ECHR. The ECtHR held that the international measure relied on by the respondent state had to be interpreted in a manner that minimised the extent to which arbitrary detention was sanctioned or required. In the latter case, the rights in issue included article 8 and the respondent state was held to be under an obligation to interpret and implement the relevant international measure in the manner that interfered to the least extent possible with the right to private life. None of these cases was concerned with the well-established international law rules relating to immunity. None of them casts doubt on the correctness of the approach adopted in cases such as Jones of upholding a well-established rule of international law unless it is required to yield to another rule of international law.

For the reasons I have already given, there is no established rule of international law relating to trafficking which takes precedence over the international law rules relating to diplomatic immunity. I should add for completeness that, for these purposes, there is no material distinction between diplomatic and state immunity. What unites them is that they are both well-established rules of international law.

Article 6

I shall assume that article 6 of the ECHR is engaged, although the contrary is strongly arguable: see Holland v Lampen-Wolfe [2000] 1 WLR 1573 per Lord Millett and Jones at para 14 (per Lord Bingham) and para 101 (per Lord Hoffmann).

Mr Otty submits that the interpretation of article 31(1)(c) for which he contends is the appropriate construction in a case in which fundamental rights such as article 6 are at stake. In summary, he submits that the contrary interpretation would involve a disproportionate interference with Ms Reyes' right of access to a court or tribunal.

Before I examine the parties' submissions in any detail, I need to refer to the important decision of the ECtHR in Fogarty v UK (2002) 34 EHRR 12. The applicant applied unsuccessfully for posts at the US Embassy in London. She issued proceedings claiming that she was the victim of sex discrimination. The US Government claimed state immunity under section 16(1)(a) of the State Immunity Act 1978. She contended that this constituted a violation of article 6(1) of the ECHR taken together with article 14. Her complaint was rejected by the Grand Chamber of the ECtHR.

The court held that the article 6(1) right of access to court is not absolute (para 33). It first considered whether the limitation of the right (in that case state immunity) pursued a legitimate aim (para 34). It held that the grant of sovereign immunity to a state in civil proceedings pursues the legitimate aim "of complying with international law to promote comity and good relations between States through respect of another State's sovereignty". I would hold that, by analogy, the recognition of diplomatic immunity in civil proceedings pursues the legitimate aim of complying with a State's international law obligations to prevent hindrance to the diplomat in performing his functions. I do not believe this to be controversial.

The court next assessed whether the restriction was proportionate to the aim pursued. It said:

"36. It follows that measures taken by a High Contracting Party which reflect generally recognised rules of public international law on State immunity cannot in principle be regarded as imposing a disproportionate restriction on the right of access to court as embodied in Article 6 § 1. Just as the right of access to court is an inherent part of the fair trial guarantee in that Article, so some restrictions on access must likewise be regarded as inherent, an example being those limitations generally accepted by the community of nations as part of the doctrine of State immunity.

37. The Court observes that, on the material before it, there appears to be a trend in international and comparative law towards limiting State immunity in respect of employment-related disputes. However, where the proceedings relate to employment in a foreign mission or embassy, international practice is divided on the question whether State immunity continues to apply and, if it does so apply, whether it covers disputes relating to the contracts of all staff or only more senior members of the mission. Certainly, it cannot be said that the United Kingdom is alone in holding that immunity attaches to suits by employees at diplomatic missions or that, in affording such immunity, the United Kingdom falls outside any currently accepted international standards.

38. The Court further observes that the proceedings which the applicant wished to bring did not concern the contractual rights of a current embassy employee, but instead related to alleged discrimination in the recruitment process. Questions relating to the recruitment of staff to missions and embassies may by their very nature involve sensitive and confidential issues, related, inter alia, to the diplomatic and organisational policy of a foreign State. The Court is not aware of any trend in international law towards a relaxation of the rule of State immunity as regards issues of recruitment to foreign missions. In this respect, the Court notes that it appears clearly from the materials referred to above (see paragraph 19) that the International Law Commission did not intend to exclude the application of State immunity where the subject of proceedings was recruitment, including recruitment to a diplomatic mission.

39. In these circumstances, the Court considers that, in conferring immunity on the United States in the present case by virtue of the provisions of the 1978 Act, the United Kingdom cannot be said to have exceeded the margin of appreciation allowed to States in limiting an individual's access to court.

In short, the court held that compliance with a state's international law obligations is conclusive on the issue of proportionality. In my view, although there are important differences between state immunity and diplomatic immunity, these differences are immaterial to the point of principle that the court enunciated at para 36. The central point is that restrictions on the right of access to court which reflect generally recognised rules of public international law cannot in principle be regarded as disproportionate. The court added that this is so even if international practice as to the meaning or scope of an international obligation is inconsistent, provided that the interpretation applied by the state in question is reasonable and falls within currently accepted international standards.

Mr Otty's submissions may be summarised as follows. First, the right of access to a court is one of the key rights in a democratic society governed by the rule of law and any ambiguity in article 31(1)(c) should be resolved in favour of a meaning which promotes access to justice. Secondly, the obligation to secure to individuals in the United Kingdom the rights afforded by the ECHR is not displaced by subsequently entering into international treaties which interfere with those rights. Thirdly, the relaxation of the scope of state immunity in relation to employment law disputes (as set out in the United Nations Convention on Jurisdictional Immunities of States and their Property 2004) ("the 2004 Convention") is relevant to the consideration of proportionality under article 6 of the ECHR in the context of claims against diplomatic agents. Mr Otty also relies on Cudak v Lithuania (2010) 51 EHRR 15 and Sabeh El Leil v France (2012) 54 EHRR 14. Fourthly, to engage in trafficking would not be "incidental" to the performance of a diplomatic function, but would be wholly inimical to it and to the dignity of the mission.

I would reject these submissions largely for the reasons given by the respondents and the Secretary of State. Nobody would dispute that the right of access to court is a fundamental right in a democratic society which is governed by the rule of law. But the article 6(1) right of access to court is not absolute and may be subject to limitations "since the right of access by its very nature calls for regulation by the State" and states "enjoy a margin of appreciation": Fogarty para 33.

There is a clear distinction between state immunity and diplomatic immunity as regards the detailed principles and the aims of each doctrine. As the ECtHR recognised in Fogarty at para 34:

"……..sovereign immunity is a concept of international law, developed out of the principle par in parem non habet imperium, by virtue of which one State shall not be subject to the jurisdiction of another State. The Court considers that the grant of sovereign immunity to a State in civil proceedings pursues the legitimate aim of complying with international law to promote comity and good relations between States through the respect of another State's sovereignty."

Diplomatic immunity by contrast is functional in nature. The preamble to the 1961 Convention records that "the purpose of such privileges and immunities is not to benefit individuals but to ensure the efficient performance of the functions of diplomatic missions as representing States". Thus, as Mr Eicke says, even if the detailed rules of international law relating to state immunity have been altered by the 2004 Convention, it does not follow that the international law principles relating to diplomatic immunity must follow suit. Those negotiating the 2004 Convention may have felt that a recalibration between the interests of state sovereignty and the interests of enforcement of the receiving state's employment law was appropriate. There is no suggestion that the international community feels that a similar adjustment is required in relation to diplomatic immunity. Mr Otty cites the decision of the Supreme Court of Portugal in Fonseca v Larren as indicating that other signatories to the 1961 Convention do not regard it as requiring immunity to be afforded to diplomatic agents in respect of claims brought by domestic workers. But this is a solitary authority. It is, therefore, of little value as evidence of the contents of international law: see also para 27 above. As Mr Eicke says, the 1961 Convention remains an authoritative statement of international law on diplomatic immunity.

The authorities are clear that, in this context, the compatibility of the limitation on access to a court with the state's international law obligations is determinative. This has recently been emphasised by the ECtHR in Jones v United Kingdom (2014) 59 EHRR 1. The court said:

"189. As to the proportionality of the restriction, the need to interpret the Convention so far as possible in harmony with other rules of international law of which it forms part, including those relating to the grant of State immunity, has led to the Court to conclude that measures taken by a State which reflect generally recognised rules of public international law on State immunity cannot in principle be regarded as imposing a disproportionate restriction on the right of access to a court as embodied in Article 6 § 1. The Court explained that just as the right of access to court is an inherent part of the fair trial guarantee in Article 6 § 1, so some restrictions must likewise be regarded as inherent, an example being those limitations generally accepted by the community of nations as part of the doctrine of State…..

191. In Al-Adsani (cited above) decided in 2001, the Court found that it had not been established that there was yet acceptance in international law of the proposition that States were not entitled to immunity in respect of civil claims for damages concerning alleged torture committed outside the forum State. There was therefore no violation of Article 6 § 1 where the domestic courts had struck out the applicant's claim against Kuwait for civil damages for torture in application of the rules of State immunity contained in the 1978 Act. The same conclusion was reached in 2002 in Kalogeropoulou and Others, cited above, in respect of the refusal of the Greek Minister of Justice to grant leave to the applicants to expropriate German property in Greece following a judgment in their favour concerning crimes against humanity committed in 1944. However, the Court there indicated that its finding in Al-Adsani did not preclude a development in customary international law in the future….

193. The applicants argued that the Court should depart from the approach of the Grand Chamber in Al-Adsani to the extent that the latter had failed to conduct a substantive proportionality assessment, including an assessment of the circumstances and merits of the individual case, and in particular to consider whether alternative means of redress existed.

194. In Al-Adsani the decisive question when assessing the proportionality of the measure was whether the immunity rules applied by the domestic courts reflected generally recognised rules of public international law on State immunity.

195. Having regard to the precedent established by Al-Adsani and the detailed examination in that judgment of the relevant legal issues by reference to this Court's case-law and international law, the Court does not consider it appropriate to relinquish the present case to the Grand Chamber. In elaborating the relevant test under Article 6 § 1 in its Al-Adsani judgment, the Court was acting in accordance with its obligation to take account of the relevant rules and principles of international law and to interpret the Convention so far as possible in harmony with other rules of international law of which it forms part……"

It follows that the international law obligations in relation to diplomatic immunity are not incompatible with article 6 of the ECHR. The ECHR must be interpreted so far as possible in conformity with other rules of international law. For the reasons I have given above, on the true interpretation of article 31(1)(c) of the 1961 Convention, diplomatic immunity is not excluded in relation to claims for compensation by domestic workers who have been trafficked.

Conclusion on the article 31(1)(c) issues

For the reasons that I have given, the President of the EAT was right to uphold the respondents' claim to immunity in answer to the claim made by Ms Reyes. This may appear to be an affront to one's sense of justice and fairness, but as Sir Daniel Bethlehem says in his skeleton argument, it is salutary to bear in mind the concluding words of the decision in Tabion:

"….there may appear to be some unfairness to the person against whom the invocation occurs. But it must be remembered that the outcome merely reflects policy choices already made. Policymakers….have believed that diplomatic immunity not only ensures the efficient functioning of diplomatic missions in foreign states, but fosters good will and enhances relations among nations. Thus, they have determined that apparent inequity to a private individual is outweighed by the great injury to the public that would arise from permitting suit against the entity or its agent calling for application of immunity. "

The service issue

The following methods of service were attempted in this case: (i) the ET1 claim form was sent to the respondents' domestic address; (ii) the ET1 claim form was sent to the Saudi Arabian Embassy; and (iii) the ET3 response to claim form was sent to the respondents' solicitors. In each case, the document was sent by post.

The Tribunal rules in force at the relevant time were The Employment Tribunals (Constitution and Rules of Procedure) Regulations 2004 (SI/2004/1861) ("the Tribunal rules"). Service by each of the methods attempted was effective service in accordance with the Tribunal Rules: see, in particular, rule 61(1)(a) which explicitly permits service by post.

The question of service was dealt with by the President of the EAT as follows:

"47. There remain two further matters. The first was a further ground of appeal: that the Tribunal erred in law in regarding service of proceedings as having been validly effected. Mr Sethi relies heavily on the inviolability of a diplomatic agent; and on Adams v Director of Public Prosecution [2000] IEHC 45. He is supported by the views of Eileen Denza, Diplomatic Law, pp 268-269, since personal service is a 'manifestation of the enforcement jurisdiction of the receiving State and therefore a contravention of personal inviolability' just as 'service of process even by post on inviolable premises…..is a breach of their inviolability.'"

48. The answer to this given by Mr Luckhurst is that these principles relate to personal service, and do not apply to service by post on solicitors who were already acting for them (as occurred in the present cases). In any event, the fact that there are some categories of civil proceedings which are expressly contemplated as being outside the scope of diplomatic immunity necessarily envisages the service of proceedings in such cases, so that there can be no blanket prohibition on such service. No decided case supports the contention that service cannot be effected by post on a diplomatic residence. Moreover, if the rights secured by article 6 were broken by the assertion of diplomatic privilege, the provisions as to service should be applied in a manner which provided effective protection of that right.

49. In my view, the conclusions to which the Employment Judge came at paragraphs 72 and 73 of her reasons, accepting and adopting the arguments Mr Luckhurst advanced, are correct. For these reasons, the appeal on this ground fails."

Sir Daniel Bethlehem submits that all attempts to effect service on the respondents were invalid. The attempt to serve by post on the Embassy was invalid due to the inviolability of diplomatic mission premises. Article 22(1) of the 1961 Convention provides: "The premises of the mission shall be inviolable". The attempt to serve the proceedings at the residence of the respondents (as well as by personal service on the respondents) was also precluded by the principle of inviolability. Article 29 provides: "The person of a diplomatic agent shall be inviolable"; and article 30(1) provides that "the private residence of a diplomatic agent shall enjoy the same inviolability and protection as the premises of the mission". In response to the holding that service was validly effected on the respondents' solicitors, Sir Daniel relies on the fact that the solicitors had expressly stated (in their letter dated 10 October 2011) that they were not authorised to accept service. The President adopted the view expressed at para 73 of the judgment of the ET, namely: "this was just a device…the solicitors were acting for [the respondents] before and after. They have appeared to argue the issue today…."

The respondents say that (i) there cannot be valid service of proceedings on a solicitor who does not have authority to accept service; and (ii) it is standard practice (and not a "device") for a solicitor who is not authorised to accept service to say so.

It would be odd if service were not possible. It is true that the 1961 Convention (i) makes clear that the person of a diplomatic agent is inviolable and a mission and the private residence of a diplomatic agent are inviolable, and (ii) generally accords a diplomatic agent immunity from civil and administrative jurisdiction. But the Convention clearly precludes immunity in three situations, including in respect of actions relating to commercial activity outside the diplomatic agent's official functions. If service could never be effected on a diplomatic agent (except by consent), the three carefully crafted exclusions to immunity would be futile. It is pointless to say in one breath that a diplomatic agent may be liable to suit in civil and administrative proceedings, but in the next breath that such proceedings may never be served on a diplomatic agent (except with his consent). The parties to the 1961 Convention could not have intended such a state of affairs. Such an interpretation of the Convention would be incompatible with one of the core principles of treaty interpretation, namely that "the object and purpose" of the treaty should be taken into account: see article 31(1) of the VCLT.

I agree with the respondents that personal service at the mission is prohibited by article 22 of the 1961 Convention. I also agree that all personal service on the diplomatic agent is prohibited by article 29: see Hellenic Lines Ltd v Moore 345 F.2d 978 (D.C. Cir. 1965) per Chief Judge Bazelon which decided that, as a matter of international law, personal service of a claim against the state of Tunisia could not be effected on the Tunisian Ambassador. See also Eileen Denza, Diplomatic Law at p. 268.

It is right to mention that the US Court of Appeals (2^nd Circuit) decision in Tachiona v United States 386 F. 3d 205, 221-224 suggested that personal service of proceedings is not prohibited in cases which fall within the exceptions to immunity set out in article 31(1) of the 1961 Convention. But in my view the language of article 29 is uncompromisingly clear. On its face, it admits of no exceptions. It is difficult to see how an exception from the principle of personal inviolability that is enshrined in article 29 can be carved out to accommodate the service of claims which fall within the exceptions to diplomatic immunity. The inviolability of the diplomatic agent is central to the 1961 Convention. If it had been intended to exclude the operation of article 29 as regards the service of claims which fall within the exception to immunity, it would have been easy enough so to provide. But the Convention does not do so expressly. I accept that, if personal service were the only means by which claims within the exceptions to immunity could be served on a diplomatic agent, there would be an argument for holding that article 29 must, by necessary implication, be interpreted as permitting personal service in respect of such claims. For the reasons that follow, however, I accept the submission of Mr Otty that service of proceedings which fall within the exceptions to immunity can be effected by post.

I need to repeat that article 30 of the 1961 Convention provides that "the private residence of a diplomatic agent shall enjoy the same inviolability and protection as the premises of the mission"; and that article 22(1) provides that "the premises of the mission shall be inviolable. The agents of the receiving State may not enter them, except with the consent of the head of the mission". As a matter of ordinary language, it is difficult to see why posting documents to the private residence of a diplomatic agent by way of service of proceedings on him infringes the inviolability of his residence. It certainly does not involve entry into the residence by agents of the receiving State.

In Renchard v Humphreys and Harding 59 FRD 530 (1973), 63 ILR 21 the District Court of the District of Columbia found that service on the state of Brazil had been validly effected by registered post to the Brazilian Embassy. The court held at p 23 that the purposes of diplomatic immunity were not violated by registered mail service on an embassy. The reasons it gave for this conclusion were that, unlike the situation where a federal marshal attempts service on an ambassador personally, the delivery of a letter to the embassy does not affront the ambassador's personal dignity. Nor does service by registered mail cause public embarrassment to the ambassador or cause him to restrict his movements to avoid being served with process. The Hellenic Lines decision was distinguishable because that case was concerned with personal service and not service by post.

I find the reasoning in Renchard persuasive. The question of whether service by post on a mission or the private residence of a diplomatic agent is valid does not appear to have received much attention from judges or academic commentators. In Volume II of the Yearbook of the ILC of 1958, paragraph (5) of the commentary on article 20 (which became article 22) stated that a special application of the principle of the inviolability of a mission was that no writ may be served within the premises of the mission. It said that process servers may not enter the premises or carry out their duty at the door: "The service of such documents should be effected in some other way". It continued: "There is nothing to prevent service through the post if it can be effected in that way". It is also relevant that at the meeting of 4 June 1958 Sir Gerald Fitzmaurice said:

"The last sentence in paragraph 2 of the commentary was unnecessarily categorical in saying that all judicial notices of that nature must be served through the Minister of Foreign Affairs of the receiving State. There was in fact no reason why judicial notices should not be sent through the post" (para 24).

That seems clear enough. But I should refer to a comment made by Japan when withdrawing a proposed amendment at the 1961 Vienna Conference. Japan had proposed an amendment which would have prohibited service by a process server within the mission premises. The Conference records that the Japanese amendment was withdrawn "on the understanding that it was the unanimous interpretation of the Committee that no writ could be served, even by post, within the premises of a diplomatic mission" (emphasis added). However, Volume II of the Official Records of the Conference contains the comment that the Japanese delegation wished the issue of postal service to be "clarified one way or the other". It stated: "The Japanese Government is prepared to accept whatever decision this conference will make on this point".

Moreover, the records of the Conference appear to show that the states were largely content to leave draft article 20 in the form in which it had previously been drafted. Many states were opposed to any amendment and little attention was paid to the Japanese proposal or the basis on which it was withdrawn. This is perhaps not surprising in view of the relaxed attitude adopted by the Japanese delegation. In fact, the Turkish delegation was one of the few to comment on the proposed amendment. Mr Asiroglu said that his delegation "had some doubts of the value of the Japanese amendment, since a writ could well be transmitted through the Ministry of Foreign Affairs or even by post": see Volume I of the Official Records of the Conference (paragraph 31 of the 22^nd meeting).

It seems to me that the position in relation to service by post is not as clear as one would wish. There appears to be no clear jurisprudence in support of the proposition that article 22 prohibits service of proceedings on a mission or on the private residence of a diplomatic agent by post. There is some support in the jurisprudence and in the travaux preparatoires for the 1961 Convention for the proposition that service can be effected by post. I have already said that I find the reasoning in Renchard to be persuasive.

For the reasons I have given at para 83 above, the parties to the 1961 Convention must have intended that service could be effected on diplomatic agents in cases which come within the exceptions to immunity. The only realistic possibilities are personal service or service by post (and now by fax and email). I have rejected personal service for the reasons I have given at paras 84 and 85 above. Service through diplomatic channels remains to be considered. The difficulty with this lies in its unreliability: the receiving state may refuse to effect service by these means. The likelihood of this occurring was noted by the UK delegate at the UN session in 1958: see paragraph 36 of Volume I of the records in the Yearbook of the ILC for that year. The same point was recorded by Chief Judge Bazelon at footnote 3 to his judgment in Hellenic Lines.

In some jurisdictions, service may be effected by sending the relevant document to the respondent's authorised representative or by means of substituted service. But such mechanisms for service are not universal. I do not consider that the parties to the 1961 Convention would have intended this to be the sole means of effecting service.

I conclude therefore that, subject to the rules of the relevant court or tribunal, service within the jurisdiction can be effected by posting the documents to a mission and to the private residence of a diplomatic agent.

In the present case, the ET found that Ms Reyes' claim form was served at the respondents' private residence. In my view, that was good service.

Overall conclusion

For the reasons I have given, I would dismiss both the appeal and the cross-appeal.

Lady Justice Arden:

I agree.

Lord Justice Lloyd Jones:

I also agree.