(1) In this section -
"qualifying lease", in relation to a house, means, subject to section 365(1), a lease of the house the duration of which is not less than 12 months and the consideration for the grant of which consists -
(a) solely of periodic payments all of which are or are to be treated as rent for the purposes of Chapter 8 of Part 4, or
(b) of payments of the kind mentioned in paragraph (a), together with a payment by means of a premium which does not exceed 10 per cent of the relevant cost of the house;
"qualifying premises" means, subject to subsections (2), (3)(a) and (4) of section 365, a house -
(a) the site of which is on a designated island,
(b) which is used solely as a dwelling,
(c) the total floor area of which -
(i) is not less than 30 square metres and not more than 125 square metres in the case where the house is a separate self-contained flat or maisonette in a building of 2 or more storeys, or
(ii) in any other case, is not less than 35 square metres and no