10.—(1) A local authority must, before the beginning of the funding period and after carrying out any consultation required by regulation 9(2), decide upon the formula which they will use to determine the budget shares for schools maintained by them (other than special schools, pupil referral units, nursery schools and in relation to nursery classes in schools maintained by them).
(2) A local authority must use the formula determined under paragraph (1) in all determinations of school budget shares in respect of the funding period.
(3) A local authority must, before the beginning of the funding period and after carrying out any consultation required by regulation 9(2) or 9(3), decide upon the formula they will use to determine—
(a)the budget shares for nursery schools maintained by them;
(b)the amounts to be allocated in respect of nursery classes in schools maintained by them; and
(c)the amounts to be allocated to relevant early years providers in their area.
(4) A local authority must use the formula determined under paragraph (3) in all determinations of budget shares for nursery schools maintained by them, the amounts to be allocated in respect of nursery classes in schools maintained by them and the amounts to be allocated to relevant early years providers in their area in respect of the funding period.
(5) A local authority may not make changes to their formulae after the funding period has commenced.