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Agree that first image is GBB Gull but think second image shows Herring Gulls - the bird at the front is not in adult plumage but already has some grey feathers in its wing. Not sure about the third though - immature gulls not really my thing!
Not being picky, but isn't it GREAT not greater?
Not sure just going on wot my book say's
Lat/Lng: 50.607, -1.948
OS grid ref: SZ037785