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Without seeing the legs or the tail it is not rally possible to be certain whether this is a herring or lesser black back
The pattern on the tertials is a very good ID feature.
Lesser Black-backed Gulls have dark centred tertials with only a narrow pale border when they are immature, Herring Gulls have the 'oak leaf' shaped dark centres with obvious pale spots along the edges of the tertials (as seen here).
Leg colour would actually be of no use because the legs of immatures of both species are pink.
ok ill upload another picture of it stood up then :)
Lat/Lng: 53.7, -2.8
OS grid ref: SD5129