Where the house is let under a tenancy for a specified period not exceeding 12 months and—
(a)not later than the date of commencement of the tenancy the landlord (or, where there are joint landlords, any of them) gave notice in writing to the tenant that possession might be recovered on this Ground; and
(b)at some time within the period of 12 months ending on that date the house was subject to such a tenancy as is referred to in paragraph 7(1) of Schedule 4 to this Act;
and for the purposes of this Ground a tenancy shall be treated as being for a specified period—
(i)not exceeding 12 months, if it is determinable at the option of the landlord (other than in the event of an irritancy being incurred) before the expiration of 12 months from the commencement of the period of the tenancy; and
(ii)exceeding 12 months, if it confers on the tenant an option for renewal of the tenancy for a period which, together with the original period, exceeds 12 months, and it is not determinable as mentioned in paragraph (i) above.