(1)The sum which on or before the first day of January, nineteen hundred and twenty-six, becomes payable under the Tithe Acts, 1836 to 1891, in respect of any tithe rentcharge, shall be the sum payable in respect of that rentcharge as ascertained by the septennial average prices published under the [45 & 46 Vict. c. 37.] Corn Returns Act, 1882, in the month of January, nineteen hundred and eighteen.
(2)The Board of Agriculture and Fisheries shall, after the twenty-fifth day of December in the year nineteen hundred and twenty-five, and in each succeeding year, compute in the same manner as the septennial average is directed to be computed under the Corn Returns Act, 1882, and shall publish in the London Gazette in the month of January following the average price of each sort of British corn for the preceding fifteen years, and the sum payable under the Tithe Acts, 1836 to 1891, in respect of any tithe rentcharge payable after the first day of January, nineteen hundred and twenty-six, shall be ascertained by the average prices so computed for the preceding fifteen years in substitution for the septennial average referred to in the Corn Returns Act, 1882.