(1) A power conferred by an enactment may be exercised from time to time as occasion requires.
(2) A power conferred by an enactment on the holder of an office as that holder shall be deemed to be conferred on, and may accordingly be exercised by, the holder for the time being of that office.
(3) A power conferred by an enactment to make a statutory instrument shall be read as including a power, exercisable in the like manner and subject to the like consent and conditions (if any), to repeal or amend a statutory instrument made under that power and (where required) to make another statutory instrument in place of the one so repealed.