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, forms 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, notification, 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, forms or bye-laws.