A general development order may make different provision with respect to different descriptions of land.
For the purpose of enabling development to be carried out in accordance with planning permission, or otherwise for the purpose of promoting proper development in accordance with the development plan, a development order may direct that any pre 1947 Act enactment, or any regulations, orders or byelaws made at any time under any such enactment—
shall not apply to any development specified in the order, or
shall apply to it subject to such modifications as may be so specified.
In subsection (2) "pre 1947 Act enactment" means—
any enactment passed before 6th August 1947 (the date of the passing of the 1947 Act), and
any enactment contained in the Highways Act 1980 which—
is an enactment derived from the Highways Act 1959, and
re-enacts (with or without modifications) any such enactment as is mentioned in paragraph (a).