30.—Every regulation made under this Act (other than a regulation under section 7) shall be laid before each House of the Oireachtas as soon as may be after such regulation is made and, if a resolution annulling such regulation is passed by either House of the Oireachtas within the next subsequent twenty-one days on which that House has sat after such regulation has been laid before it, such regulation shall be annulled accordingly, but without prejudice to the validity of anything previously done under such regulation.