1.—(1) Subject as hereinafter in this Schedule provided, the amount of a subsistence, refreshment or lodging allowance payable under regulation 40 shall be in accordance with such scale as shall be determined by the Secretary of State.
(2) The scales of refreshment allowances shall provide for the allowance payable in respect of one meal and that payable in respect of two meals.
(3) The scales of subsistence allowances shall provide for the allowance payable in respect of a period of retention or engagement on duty of—
(a)over 5 hours but not exceeding 8 hours;
(b)over 8 hours but not exceeding 12 hours;
(c)over 12 hours but not exceeding 24 hours;
(d)over 24 hours.