16.—Every regulation and order under this Act (except an order under section 19(2)) 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 subsequent 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.