(a) are destroyed, or made
completely or partly unfit to live in, in a way that does not result from a
breach of the agreement; or
(b) no longer may be used lawfully as a
residence; or
(c) are appropriated or acquired compulsorily by an authority.
(2) This section also applies if—
(a) services, facilities or goods to be
provided to the tenant under the agreement are no longer available or are
withdrawn other than because the tenant failed to meet the tenant’s
obligations under the agreement; or
(b) the amenity or standard of the
premises decreases substantially other than because of malicious damage caused
by the tenant.
(3) The rent payable under the agreement decreases accordingly
or, if an order for a decrease in the rent is made by a tribunal, to the
extent stated in the order.
(4) A tribunal may make an order for a rent
decrease only if—
(a) the tenant applies to the tribunal for the order; and
(b) if this section applies because of subsection (1) —the premises are
partly unfit to live in.