18.—(1) The constituent authorities must make a contribution in respect of any reasonably incurred costs of TfN if they all agree on—
(a)the need for a contribution, and
(b)the amount required.
(2) The amount of any contribution under paragraph (1) is to be apportioned between the constituent authorities—
(a)in proportion to the total resident population of the area of each authority at the relevant date as estimated by the Statistics Board(1), or
(b)on such other basis as may be agreed by all the constituent authorities.
(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) Each constituent authority may contribute to the costs of TfN individually if it chooses to do so.
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).