No interactions present.
There is a sub-species which is the British bird - Larus fuscus subsp. graellsii. You may be corrected.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks for warning, wasn't sure which sub this was and hoping to be edumicated
Lat/Lng: 51.9468376, 1.0740028
OS grid ref: TM113320