"specifying the person or persons on whom the liability to pay duty on the goods is to fall at the excise duty point (being the person or persons having the prescribed connection with the goods at that point or at such other time, falling no earlier than when the goods become chargeable with the duty, as may be prescribed."
"(a) the time when the excise goods are delivered for home use from a tax warehouse or are otherwise made available for consumption, including consumption in a warehouse;
(b) the time when the excise goods are consumed;
(f) the time when the excise goods leave any tax warehouse unless
(i) the goods are consigned to another tax warehouse in respect of which the authorised warehouse keeper has been approved in relation to the deposit and keeping of those goods, and the goods are moved in accordance with requirements prescribed in regulations 9 and 10 below;
"so far as they have effect for fixing the excise duty point or determining the person on whom any liability to pay any such duty is to fall, shall have effect subject to the provisions of any regulations under section 1"
But if Parliament is to impose fiscal liabilities which might be regarded as draconian it should do so in terms which, fairly construed, are reasonably clear.