8.—(1) Where—
(a)a review of a determination has been carried out in accordance with regulation 7 and a different determination substituted,
(b)in consequence of the first determination a local authority (“A”) has paid an amount to another local authority (“B”), and
(c)the effect of the second determination is that some or all of the amount paid by A to B was not required to have been paid,
B must repay to A the sum that was not required to have been paid.