15.—(1) No stage of the authorised development must commence until further survey work for that stage has been carried out to establish whether any protected species is present on any of the land affected, or likely to be affected, by that part of the authorised development.
(2) Where a protected species is shown to be present, no authorised development of that part must commence until, after consultation with Natural England and the Environment Agency, a scheme of protection and mitigation measures has been submitted to and approved in writing by the relevant planning authority.
(3) The authorised development must be implemented in accordance with the approved scheme unless otherwise agreed with the relevant planning authority.