The dwelling-house—

1. (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

2. (b)

   was let to the tenant or a predecessor in title of his in consequence of the tenant or predecessor being in the employment of—

• the landlord,

• a local authority,

• a new town corporation,

• F1a housing action trust

• F2. . .

• an urban development corporation, or

• the governors of an aided school.