Subsection (1) of section 20 of this Act applies (subject to the provisions of that section) to the carrying out of development whether before or after the commencement of this Act, except that it does not apply to development carried out on or before the appointed day.

In sections 23 and 24 of this Act references to an application for planning permission do not include references to any application made before 16th August 1959.

Subsection (2)(b) of section 23, and the other provisions of that section relating to subsection (2)(b), do not apply to any application made before 18th May 1970.

Where by virtue of the proviso to subsection (3) of section 3 of the M1Town and Country Planning (Amendment) Act 1951 (works for making good war damage which were begun between the appointed day and 13th December 1950) any works were, immediately before the commencement of this Act, treated for the purposes of that Act as if planning permission had been granted unconditionally in respect thereof, those works shall be so treated for the purposes of this Act also.