5.—(1) The right to buy does not arise if the qualifying dwelling-house—
(a)forms part of, or is within the curtilage of, a building which, or so much of it as is held by the landlord, is held mainly for purposes other than housing purposes and consists mainly of accommodation other than housing accommodation, or is situated in a cemetery, and
(b)was let to the qualifying person or a predecessor in title of his in consequence of the qualifying person or predecessor being in the employment of
the landlord or of—
a local authority,
a new town corporation,
a housing action trust,
the Development Board for Rural Wales,
an urban development corporation, or
the governors of an aided school.
(2) In sub-paragraph (1)(a) “housing purposes” means the purposes for which dwelling-houses are held by local housing authorities under Part II (provision of housing) or purposes corresponding to those purposes.