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I should have added that I believe the darker back and whiter wing tips rule out the Yellow-legged Gull.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
O.K. Lesser black-backed gull it is then. I have changed the title accordingly.
Lat/Lng: 50.5644, -3.6462
OS grid ref: SX835751