(1) Any permission, consent or authority, granted under this Act—
(a) may be either general or special;
(b) may be revoked by the competent authority;
(c) may be absolute or conditional;
(d) may be limited so as to expire on a specified date, unless renewed; and
(e) shall be published in such a way as, in the opinion of the competent authority, to give any person entitled to the benefit of it an adequate opportunity of getting to know of it, unless in his or her opinion publication is not necessary for that purpose.
(2) Any directions given under any provision of this Act—
(b) may be revoked or varied by subsequent directions; and
(c) shall be given to such persons and in such manner as the competent authority thinks appropriate and if so given shall be valid for all purposes.
(3) Despite subsection 2(c), a person shall not by virtue of any direction given by the competent authority under this Act, be convicted of an offence against this Act, unless the direction was served on him or her or he or she knew, or avoided getting to know, of the giving thereof.
However, where reasonable steps were taken for the purpose of bringing the purport of the direction to his or her notice, it is for him or her to show that he or she neither knew nor avoided getting to know of the giving thereof.
(4) The competent authority may, to such extent and subject to such restrictions and conditions as he or she may think proper, delegate or authorise the delegation of any of his or her powers (other than any power to make orders or to give authority to apply for a search warrant) to any person, or class or description of persons, approved by him or her, and references in this Act shall be construed accordingly.
(5) Any document stating that any permission, consent, authority or direction is given under any of the provisions of this Act by the competent authority, and purporting to be signed on his or her behalf, shall be evidence of the facts stated in the document.