Where a National Park authority has been established for any area, this section, . . ., shall apply, as from such time as may be specified for the purposes of this section in the order establishing that authority, in relation to the Park for which it is the authority.
Subject to subsections (4) and (5) below, the National Park authority for the Park shall be the sole local planning authority for the area of the Park and, accordingly—
For the purposes of subsection (2) above functions under the planning Acts which (apart from this section) are conferred—
shall be treated, in relation to those other areas, as conferred on each of those councils as the local planning authority for their area.
The functions of a local planning authority by virtue of sections 198 to 201, 206 to 209 and 211 to 215, so far as they are functions of a National Park authority by virtue of this section, shall be exercisable as respects any area which is or is included in an area for which there is a district council, concurrently with the National Park authority, by that council.
For the purposes of any enactment relating to the functions of a district planning authority, the functions of a district council by virtue of subsection (4) above shall be deemed to be conferred on them as a district planning authority and as if the district were the area for which they are such an authority.