National Parks and Access to the Countryside Act 1949

9 (1) If any person desires to question the validity of a definitive map prepared under Part IV of this Act on the ground that the map is not within the powers of this Act, or on the ground that any requirement of this Act or of any regulation made thereunder has not been complied with in relation to the preparation of the map, or of any draft or provisional map on which that map is based, he may, within six weeks after the date of publication of notice of the preparation of the map in accordance with the provisions of the said Part IV in that behalf, make an application to the High Court; and on any such application the court, if satisfied that the map is not within the powers of this Act, or that the interests of the applicant have been substantially prejudiced by a failure to comply with any such requirement as aforesaid, may make an order declaring that, notwithstanding anything contained in the said Part IV, the definitive map shall not be conclusive evidence of any such matter as may be specified in the order.

(2) References in this paragraph to a definitive map, or to a draft or provisional map, shall be construed as including references to a revised map prepared in definitive form, or to a revised map prepared in draft or provisional form, as the case may be; references therein to a map shall be construed as including references to any statement required by the provisions of Part IV of this Act to be annexed to the map; and for the purposes of this paragraph a map shall be deemed to be based on another map if the particulars contained in the former map are required by the said provisions to be the particulars contained in the latter map as modified in accordance with those provisions.