In section 20A of that Act (service charges) after the words “HousingAct 1985” there shall be inserted “ or Part VIII of the Local Government and Housing Act 1989 ” and at the end there shall be added the following subsection—

“(2)

In any case where—

(a)

relevant costs are incurred or to be incurred on the carrying out of works which are included in the external works specified in a group repair scheme,within the meaning of Part VIII of the Local Government and Housing Act 1989,and

(b)

the landlord participated or is participating in that scheme as an assisted participant,

the amount which, in relation to the landlord, is the outstanding balance determined in accordance with subsections (3) and (4) of section 130 of that Act shall be deducted from the costs, and the amount of the service charge payable shall be reduced accordingly.”