Where—
a local planning authority in Greater London propose to make, alter or replace a unitary development plan;
copies of proposed alterations of, or of a proposed new spatial development strategy to replace, the spatial development strategy have been made available for inspection under section 335(2) of the Greater London Authority Act 1999; and
the local planning authority include in any relevant copy of the plan or proposals a statement that they are making the permitted assumption,
the permitted assumption shall, subject to subsection (4), be made for all purposes (including in particular any question as to conformity between the plan and the spatial development strategy).
For the purposes of subsection (1)(c) a copy is a relevant copy of a plan or proposals if it is served on the Greater London Authority.
The permitted assumption shall not be made at any time after the local planning authority know that the proposed alterations or new spatial development strategy mentioned in subsection (1)(b) have been withdrawn. "