Sections 21 and 22 of the National Parks and Access to the M1Countryside Act 1949 (establishment of nature reserves and application of enactments to local authority reserves) shall have effect as if the bodies on whom powers are conferred by section 21 of that Act included every National Park authority and as if the relevant Park were the authority’s area; and references in those sections to a local authority and to their area shall be construed accordingly.