Housing Act 1985

10 (1) The right to buy does not arise if the dwelling-house is one of a group of dwelling-houses—

(a) which are particularly suitable, having regard to their location, size, design, heating systems and other features, for occupation by persons of pensionable age, and

(b) which it is the practice of the landlord to let for occupation by persons of pensionable age, or for occupation by such persons and physically disabled persons,

and special facilities such as are mentioned in sub-paragraph (2) are provided wholly or mainly for the purposes of assisting those persons.

(2) The facilities referred to above are facilities which consist of or include—

(a) the services of a resident warden, or

(b) the services of a non-resident warden, a system for calling him and the use of a common room in close proximity to the group of dwelling-houses.