Subject to any arrangement made by the Board under subsection (6) of section 13 above and to any regulations made by the Secretary of State under subsection (7) of that section, any sums from time to time received by the Board in the course of or in connection with the exercise of any of their functions under this Act, but otherwise than by virtue of any levy imposed under section 19 or 21 above, may be applied by the Board—
(a)in so far as the sums are received in repayment or otherwise by virtue of any general business expenditure incurred by the Board, on expenditure of that description only;
(b)in so far as the sums are received in repayment or otherwise by virtue of any long term business expenditure incurred by the Board, on expenditure of that description only.