10(1)For the purpose of determining any question arising under paragraph 7 or 8 above as to the amounts of relevant receipts and assumed interest receipts or the amounts from time to time required for the purposes mentioned in Part III of this Schedule, such assumptions shall be followed by the Secretary of State as to—
(a)the manner in which those receipts would from time to time be applied, if they were in fact applied for those purposes;
(b)the times at which payments would be made in respect of expenses and interest referred to in any paragraph of that Part of this Schedule, if such payments were in fact made; and
(c)the amounts of such payments;
as the Treasury may direct.
(2)A direction given for the purposes of this paragraph may require different assumptions to be followed in relation to different times and in relation to, or to interest on, different expenses referred to in any paragraphs of that Part of this Schedule.