(1) The Board may, in respect of any particular matter or class of matters, and in writing, delegate to the Executive Director or to any other Director, any of its functions under this Act except this power of delegation and the following functions—
(a) approving annual budgets or programme of activities;
(b) making regulations;
(c) carrying out activities which require expenditures not provided for in the budget.
(2) Subject to any general directions given to him or her by the Board, the person to whom any powers are so delegated may exercise those powers in the same manner and with the same effect as if they had been conferred on him or her directly by this Act and not by delegation.
(3) Every person purporting to act under a delegation under this section shall, in the absence of proof to the contrary, be presumed to be acting in accordance with the terms of the delegation.
(4) Every delegation under this section shall be revocable at will, and no such delegation shall prevent the exercise of any power by the Board.