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The key characteristis for telling first year Lesser BB Gull from Herring Gull is the colour of the inner primaries - a feature which is not well shown by this photograph. A flight photograph of the same bird would be definitive. In Herring gull they are pale, and in LBB Gull they are dark.
This one was being guarded/defended by its LBBG parents. So easy really.
From the pic the mantle and scapulars are dark chocolaty brown with a narrow pale margin combined with similarly marked and 'un-notched' tertials. Juvvy Herring Gulls are similarly marked but generally paler esp in die=rect comparison with noticably notched tertials
The magic of nature is all around us - we just need to learn how to see it.
Lat/Lng: 53.83657, -3.05549
OS grid ref: SD306383