6The right to buy does not arise if—
(a)the dwelling-house has features which are substantially different from those of ordinary dwelling-houses and are designed to make it suitable for occupation by physically disabled persons, and
(b)it has had those features since it was constructed or, where it was provided by means of the conversion of a building, since it was so provided.
7The right to buy does not arise if the dwelling-house has features which are substantially different from those of ordinary dwelling-houses and are designed to make it suitable for occupation by physically disabled persons, and—
(a)it is one of a group of dwelling-houses which it is the practice of the landlord to let for occupation by physically disabled persons, and
(b)a social service or special facilities are provided in close proximity to the group of dwelling-houses wholly or partly for the purpose of assisting those persons.
8The right to buy does not arise if the landlord or a predecessor of the landlord has carried out, for the purpose of making the dwelling-house suitable for occupation by physically disabled persons, one or more of the following alterations—
(a)the provision of not less than 7.5 square metres of additional floor space;
(b)the provision of an additional bathroom or shower-room;
(c)the installation of a vertical lift
9(1)The right to buy does not arise if—
(a)the dwelling-house is one of a group of dwelling-houses which it is the practice of the landlord to let for occupation by persons who are suffering or have suffered from a mental disorder, and
(b)a social service or special facilities are provided wholly or partly for the purpose of assisting those persons.
(2)In sub-paragraph (1)(a) “mental disorder” has the same meaning as in the [1983 c. 20.] Mental Health Act 1983