The Pensions Increase (Review) Order 1990
Under section 59 of the Social Security Pensions Act 1975 as amended by section 11 of the Social Security Act 1979 and as modified by section 59A of the 1975 Act (introduced by section 11(4) of the 1979 Act) the Treasury (in whom the functions conferred by those provisions are now vested) are required to provide by order for the increase in the rates of public service pensions.