18In section 28 of the 1986 Act, in subsection (1)(b) (housing benefit in respect of certain payments to housing authorities to take the form of a rent rebate) after the words “rent rebate” there shall be inserted the words “,or, in prescribed cases, of a rent allowance,” and after subsection (5) of that section there shall be inserted—
“(5A)The cases that may be prescribed under subsection (1)(b) above do not include any case where the payment in respect of which the housing benefit is granted is a payment in respect of a dwelling which, within the meaning of Part VI of the [1989 c. 42.] Local Government and Housing Act 1989, is a house or other property of an authority within the authority’s Housing Revenue Account.”