(1)Any agreement relating to a lease of any property which comprises or includes a dwelling (whether contained in the instrument creating the lease or not and whether made before the creation of the lease or not) shall be void in so far as it would otherwise have the effect of prohibiting or imposing any restriction on—
(a)the occupation of the dwelling, or of any part of the dwelling, by persons with mental disorders (within the meaning of the [1983 c. 20.] Mental Health Act 1983), or
(b)the provision of accommodation within the dwelling for such persons.
(2)Subsection (1) applies to any agreement made after the coming into force of this section.