The dwelling-house 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—
(a)the dwelling-house 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 or of—
a local authority,
a new town corporation,
an urban development corporation,
the Development Board for Rural Wales, or
the governors of an aided school,
and that employment has ceased, and
(b)the landlord reasonably requires the dwelling-house for occupation as a residence for some person either engaged in the employment of the landlord, or of such a body, or with whom a contract for such employment has been entered into conditional on housing being provided.