4. Every order (other than an order under section 1(3), 24 or 42) and regulation under this Act shall be laid before each House of the Oireachtas as soon as may be after it is made and, if a resolution annulling such order or regulation is passed by either such House within the next 21 days on which that House has sat after the order or regulation is laid before it, the order or regulation shall be annulled accordingly, but without prejudice to the validity of anything previously done thereunder.