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I've added another picture for more ID help.
Why not an 'argentatus' Herring Gull, or a yellow-legged Gull...both of which can have yellow legs?
The back does not seem very dark, even compared to a graellsii Lesser Black-Backed.
And Chew does attract different gulls...
PS: I think you are probably right!
My Flickr photos...
But do these have the red eyering?
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Sorry...colour-blind to such things!
However, being serious, I would say that yes, they certainly often do, as far as I understand. Less so in 'argentatus' Herring Gull, though.
Although he may not be able to see it Ophrys is correct about the colour of the eyering. Yellow-legged Gulls typically have red, or orange-red, eyerings, and yellow-legged individuals of the argentatus race of Herring Gull may have a deeper eye ring colour than the yellow to yellow-orange that is typical of Herring Gull.
I don't thing that it is possible to identify this bird with any degree of certainty from the photo - and to me the lack of any obvious dark band visible on the underside of the secondaries seems to point away from Lesser-black Backed Gull.
Lat/Lng: 51.3204, -2.6158
OS grid ref: ST571581