10.—(1) Subject to paragraph (4), the constituent councils must meet the costs of the expenditure reasonably incurred by the Mayor in, or in connection with, the exercise of the functions specified in Schedule 1 to the extent that the Mayor has not decided to meet these costs from other resources available to the Mayor.
(2) Any amount payable by each of the constituent councils to ensure that the costs referred to in paragraph (1) are met is to be determined by apportioning such costs between the constituent councils in accordance with the proportion to the total resident population of the GMCA which resides in the area of each constituent council at the relevant date as estimated by the Statistics Board(1), or in the alternative in such proportions as the members of the GMCA, or substitute members acting in place of those members, may unanimously agree.
(3) For the purposes of paragraph (2) the relevant date in relation to a payment for a financial year is 30th June in the financial year which commenced two years previously.
(4) In respect of the expenditure mentioned in paragraph (1) the total amount to be met by the constituent councils must not exceed £86.7 million per annum.
(5) No constituent council can be required to—
(a)vary its contribution to the expenditure mentioned in paragraph (1) as determined by the apportionment made in accordance with paragraph (2); or
(b)vary the total amount of expenditure set out in paragraph (4),
unless there is unanimous agreement by the members of the GMCA appointed by the constituent councils, or substitute members acting in place of those members.
Section 25 of the Statistics and Registration Service Act 2007 (c. 18) provides that the Statistics Board is responsible for the functions in section 19 of the Registration Service Act 1953 (c. 37).