(1) Where in this Act or any Act passed or subordinate instrument made on or after the commencement of this Act the word "may" is used in conferring a power, that word shall be construed as meaning that the power so conferred may be exercised, or not, at discretion.
(2) Where in this Act or any Act passed or subordinate instrument made on or after the commencement of this Act the word "shall" is used in conferring a power, that word shall be construed as meaning that the power so conferred must be exercised.
(3) The provisions of this section shall have effect notwithstanding any rule of construction to the contrary and any such rule is hereby abrogated with respect to this Act and any Act passed or subordinate instrument made on or after the commencement of this Act.