Any direction given under any provision of this Act or any subsidiary legislation made under it—
(a) shall be published in the Gazette;
(b) may make different provisions for different circumstances;
(c) may be varied or revoked by a subsequent direction; and
(d) unless varied or revoked by a subsequent direction, shall continue to apply although the person who gave the direction is no longer the Comptroller or an officer or, for any other reason, no longer has the authority to give such a direction.