Parliamentary scrutiny of delegated legislation: rules and specified notifications must be laid for review and may be modified or annulled. Central Government rules made under the Act and specified notifications must be laid before each House of Parliament for a defined laying period to permit parliamentary scrutiny. If both Houses agree within the laying period and the immediately following session to modify or disallow a rule or notification, the instrument will thereafter operate only in the modified form or be without effect, without prejudice to the validity of prior actions under it.