Parliamentary scrutiny of delegated rules permits modification or annulment during a following session, affecting the rule's future effect. Rules made by the Central Government under the Act are to be laid before each House of Parliament for the prescribed period; if, before the end of the immediately following session, both Houses agree to modify or annul a rule, the rule will thereafter operate only as modified or will be of no effect, without prejudice to the validity of anything previously done under that rule.