s 436 Meaning of “development” etc.
(1) In this Part— “ development ” “ development order ”, “ general development order ”, and “ planning permission ”, have the meaning given by the relevant planning enactment. (2) “ The relevant planning enactment ” means— (a) in relation to land in England or Wales, section 336(1) of the Town and Country Planning Act 1990 (c. 8); (b) in relation to land in Scotland, section 277(1) of the Town and Country Planning (Scotland) Act 1997 (c. 8); (c) in relation to land in Northern Ireland, section 250(1) of the Planning Act (Northern Ireland) 2011 .