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It certainly looks like an immature; what we can see of the back looks a bit dark for a Herring Gull, but it is hard to be certain with this angle on the bill.
Are there any more photos will the bill at another angle, or showing the legs?
Sorry, no this is the only photo I got.
Lat/Lng: 53.0173, -0.9741
OS grid ref: SK689471