7The references in section 20 of this Act to a standard contribution and to the allowable cost determined under section 19 of this Act shall be construed respectively as including references to a contribution under section 13 of the House Purchase and Housing Act 1959 and one-half of the amount referred to in section 14(1) of that Act or, as the case may be, section 51 of the [1964 c. 56.] Housing Act 1964.