Every regulation and order (other than regulations under section 15 or to which section 23(3) relates or an order under section 79) made under this Part shall be laid before each House of the Oireachtas as soon as may be after it is made and, if a resolution annulling the regulation or order is passed by either such House within the next 21 days on which that House has sat after the regulation or order is laid before it, the regulation or order shall be annulled accordingly, but without prejudice to the validity of anything previously done thereunder.