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The latest scientific name for this gull is Chroicocephalus ridibundus. You will need to update your identification.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
You were right with the Black-headed Gull but just needed to update the scientific name.
Im not sure why I put common gull ! Brain freeze I think . Thanks for the info
Lat/Lng: 51.4056, -0.7666
OS grid ref: SU858681