Commentary on provisions of the Act Planning Section 20: Deemed planning permission
Subsections (1), (3) and (4) deem planning permission under Part 3 of the Town and Country Planning Act 1990 to be granted for development authorised by the Act, subject to the other provisions of the Act and the conditions set out in Schedule 17. The conditions are enforceable by the relevant planning authority.
	Subsection (2) provides that this permission does not apply to ancillary development not comprising a scheduled work, if that development would be likely to have significant effects on the environment, unless it is exempt development or has been appropriately environmentally assessed in the environmental statement for the Act.
	Subsection (4) classifies this planning permission as "specific planning permission" for the purposes of treating the land used by Phase One as operational land of a statutory undertaker. Subsection (5) ensures that, where works are carried out by the nominated undertaker, the conditions in Schedule 17 take precedence over any permitted development rights under the normal planning regime.