No local authority shall make a supplementary charge on the tenant of a house to which the housing revenue account relates for the year 1976-77 and subsequent years.

A local authority shall reduce and terminate any supplementary charge imposed by them before the year 1976-77, subject to the approval of the Secretary of State, in whatever manner they think fit.

In this Act, " supplementary charge " means, in relation to the tenant of a house, a charge payable under his tenancy supplementary to standard rent which is related to the financial circumstances of the tenant or his household.