Paragraph 21 Amendments to approved detailsI1

With respect to any requirement which requires the authorised development to be carried out in accordance with the details approved by the relevant planning authority, the approved details must be carried out as approved unless an amendment or variation has previously been approved in writing by the relevant planning authority in accordance with sub-paragraph (2).

Any amendments to or variations from the approved details must be in accordance with the principles and assessments set out in the environmental statement. Such agreement may only be given in relation to immaterial changes where it has been demonstrated to the relevant planning authority that the subject matter of the agreement sought is unlikely to give rise to any materially new or materially different environmental effect from those assessed in the environmental statement.

The approved details must be taken to include any amendments that may subsequently be approved in writing by the relevant planning authority.