"Colne Estuary citation"(PDF). Sites of Special Scientific Interest. Natural England. Archived from the original(PDF) on 8 December 2015. Retrieved 3 November 2016.
web.archive.org
"Colne Estuary citation"(PDF). Sites of Special Scientific Interest. Natural England. Archived from the original(PDF) on 8 December 2015. Retrieved 3 November 2016.