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Despite the name, it's actually not particularly common in the UK. Passes through the south as a winter visitor, resident to the north but is only abundant in localised areas. Essentially looks like a much gentler version of the herring gull, resembling a kittiwake almost. Black eyes, yellow bill and greenish legs.
Best place to find them is coastal areas. They were fairly abundant on the West Sands by St Andrews, Scotland.
Note pic 5 for size comparison with the more common black-headed gull.