If the person to whom an enforcement order relates is aggrieved by the order and desires to question its validity on the ground—
that its making or confirmation was not within the powers of section 18 above; or
that any of the requirements of section 20 above have not been complied with in relation to it,
the person may, within forty-two days from the date of service on it of a copy of the order, make an application to the High Court under this section.
On any such application the High Court may, if satisfied that the making or confirmation of the order was not within those powers or that the interests of the person have been substantially prejudiced by a failure to comply with those requirements, quash the order or any provision of the order.
Except as provided by this section, the validity of an enforcement order shall not be questioned in any legal proceedings whatsoever.