155.— The Minister shall ensure that every regulation made by the Minister under this Part is laid before each House of the Oireachtas as soon as practicable after it is made and, if a resolution annulling the regulation is passed by either House within 21 sitting days after the day on which that House has sat after the regulation is laid before it, the regulation shall be annulled accordingly, but without prejudice to the validity of anything previously done thereunder.