In the Industrial Injuries and Diseases (Old Cases) Act 197519 the sum of £24.75 referred to in section 2(6)(c) (maximum weekly rate of lesser incapacity allowance supplementing workmen’s compensation) and section 7(2)(b) (industrial diseases benefit schemes: weekly rate of allowance payable where disablement is not total) shall be increased; and from and including 12th April 1989 for that sum in section 2(6)(c), and from and including 13th April 1989 for that sum in section 7(2)(b), there shall be substituted the sum of £26.20.