(1)For the purposes of any review under section 125 of the [1975 c. 14.] Social Security Act 1975 (under which the Secretary of State is required in each tax year to review the sums mentioned in subsection (1) of that section and in section 23(1) of the [1975 c. 60.] Social Security Pensions Act 1975 for the purpose of determining whether they have retained their value in relation to the general level of earnings or prices obtaining in Great Britain) the Secretary of State shall have regard only to prices except that as respects the sum specified in section 30(1) (excluding paragraphs (a) and (b)) of the Social Security Act 1975 he shall have regard only to earnings; and accordingly in subsection (1) of the said section 125 for the words " earnings or prices obtaining in Great Britain " there shall be substituted the words " prices obtaining in Great Britain except that as respects the sum specified in section 30(1) (excluding paragraphs (a) and (b)) of this Act he shall instead have regard to the general level of earnings obtaining in Great Britain ".
(2)In relation to a draft of an up-rating order which, in consequence of a review under the said section 125 made before the passing of this Act, falls to be prepared after the passing of this Act in pursuance of subsection (3) of that section (which provides for increasing reviewed sums which have not retained their value as mentioned in subsection (1) of that section), the restoration of value mentioned in the said subsection (3) shall be deemed to be a restoration of value by reference to prices except as respects the sum specified as aforesaid.
(3)In section 126(5) of the [1975 c. 14.] Social Security Act 1975 (under which a draft order under section 125(3) of that Act to increase a sum must provide for the increase to come into force in certain cases not later than at the end of the period of 12 months beginning with the date on which the provision fixing the current amount of the sum came into force) for the words from " of 12 months " to " came into force " there shall be substituted the words " beginning with the date on which the provision fixing the current amount of that sum came into force and ending with the last day of the month in which the first anniversary of that date falls ".