21.—(1) The Secretary of State may pay special purpose grants in respect of expenditure of any class or description specified in Schedule 5 incurred or to be incurred by the governing body of a school—
(a)for or in connection with the educational purposes so specified, or
(b)in respect of any expenses so specified being expenses which it appears to the Secretary of State the governing bodies of schools cannot reasonably be expected to meet from maintenance grant.
(2) Special purpose grants may be paid on a regular basis in respect of expenditure of a recurrent kind or by reference to expenditure incurred or to be incurred on particular occasions or during any particular period.