4(1)The Secretary of State may, out of money provided by Parliament, make a contribution towards the following expenses, of any local authority (if approved by him), that is to say—E+W+S
(a)any expenses of the local authority in making payments under paragraph 1;
(b)any expenses incurred by them in making, in or in connection with old private dwellings owned by them or under their control, adaptations to avoid contraventions of section 20; and
(c)any expenses incurred by them in carrying out adaptations required by notices under section 24 in or in connection with old private dwellings.
(2)A contribution under this paragraph in respect of any expenses shall be a single payment equal—
(a)in the case of expenses mentioned in sub-paragraph (1)(a), to four-sevenths of the amount of the expenses;
(b)in the case of expenses mentioned in sub-paragraph (1)(b), to two-fifths of the amount of the expenses; and
(c)in the case of expenses mentioned in sub-paragraph (1)(c), to four-sevenths of the amount arrived at by deducting the recoverable amount from the amount of those expenses.
(3)In sub-paragraph (2)(c), “the recoverable amount” means, in relation to any expenses, the fraction of those expenses (whether three-tenths or some smaller fraction determined by the local authority, in the case of those expenses, under section 24(2) or (3)) which the local authority have power to recover from the occupier or owner by virtue of section 24(2) or (3).