This section applies in relation to relevant planning permission granted or deemed to be granted—
The condition is deemed to provide instead that the development to which the relevant planning permission relates must be begun not later than 1 May 2021.
The time by which the development to which the relevant planning permission relates must be begun is not to be extended (whether by section 91(3B) or otherwise) to a later time than that for the time being provided for in subsection (2).
The reference in subsection (1) to relevant planning permission being granted, or deemed to be granted, subject to a condition which has the effect mentioned in paragraph (b) of that subsection includes a reference to the permission being subject to a condition which has that effect by virtue of being subsequently modified (whether by section 91(3B) or otherwise).