24(1)For the purposes of section ninety-four of the Act of 1948 (which provides for the adjustment, for changes in the average rates, of payments by the British Transport Commission for the benefit of local authorities) it shall be sufficient for the aggregate gross charge to rates for England and Wales to be estimated and certified by the Minister instead of being ascertained and certified by him as provided by subsection (2) of the said section ninety-four.
(2)For the purposes of the said subsection (2) the rateable value for England and Wales for any year shall be taken to be the aggregate of the rateable values for that year of the areas of all rating authorities in England and Wales, and the rateable value of the area of a rating authority for any year shall be taken to be the aggregate, as certified by the valuation officer, of the rateable values shown on the first day of that year in the valuation list in force on that day for that area, subject however to any alteration in the list made in consequence of the provisions of any enactment (including an enactment contained in this Act) whereby the alteration is to be treated as having been made at the beginning of the year.