(1) A separate appropriation, in accordance with which the Crown is authorised to incur expenses, is made for—
(a) the category of output expenses set out in column 3 of Schedule 3:
(b) each of the categories of other expenses set out in column 3 of Schedule 3.
(2) Each appropriation provided by subsection (1) is limited to—
(a) the period specified in column 4 of Schedule 3 alongside the relevant appropriation; and
(b) the amount specified in column 5 of Schedule 3 alongside the relevant appropriation; and
(c) the scope shown in the Estimates for the relevant appropriation.
(3) The appropriations provided by subsection (1) include the expenses that have been incurred—
(a) under any Imprest Supply Act passed in relation to this year; and
(b) in advance, but within the scope, of one of those appropriations.