Family Allowances and National Insurance Act 1967

5 (1) Where for any purpose of the provisions amended by section 1(1)(b) of this Act the weekly rate at which a person contributes to the cost of providing for a child is to be calculated for a period after section 1(1)(b) applies, but account is taken of amounts referable to the period before it applies, then those amounts shall be treated as increased in proportion to the increase effected by section 1(1)(b) in the required rate of contributions.

(2) In the case of any payment of benefit of which the amount is increased by this Act, the like principle shall be applied for purposes of section 42(1)(b) of the [1965 c. 51.] National Insurance Act 1965 or section 17(4)(b) of the [1965 c. 52.] National Insurance (Industrial Injuries) Act 1965 as is to be applied under sub-paragraph (1) above in the case provided for by that sub-paragraph.