Power to make rules etc., includes power to add, amend, vary or rescind rules etc.

Where, by any enactment, a power to issue rules, notifications, orders, schemes, froms or bye-laws is conferred, then, unless a different intention appears that power includes a power to add, to amend, vary or rescind any rules, notifications, orders, schemes, forms, or bye-laws, so issued in the same manner and subject to the same sanction and condition (if any) as the power to issue the rules, notifications, orders, schemes, froms, or bye-laws.