(a) the tenancy vested in him by virtue of section 89 (succession to a periodic tenancy), or
(b) he was a joint tenant and has become the sole tenant, or
(c) the tenancy arose by virtue of section 86 (periodic tenancy arising on the ending of term certain) and the first tenancy there mentioned was granted to another person or jointly to him and another person, or
(d) he became the tenant on the tenancy being assigned to him (but subject to subsections (2) and (3)) or
(e) he became the tenant on the tenancy being vested in him on the death of the previous tenant or
(f) the tenancy was previously an introductory tenancy and he was a successor to the introductory tenancy."
"Where a secure tenancy ('the first tenancy') is a tenancy for a term certain and comes to an end by effluxion of time a periodic tenancy of the same dwelling-house arises by virtue of this section "