@CiaraNi I think this is an almost mature lesser black backed gull / Baltic gull. The black on its bill will turn red, and its eye will become yellow when mature.
@jgrg@CiaraNi we do have lesser black backed gulls (and great black backed - they’re really big) in the UK but they seem not as adjusted to dealing with humans as Herring Gulls.
@aimaz@jgrg I am so accustomed to seagulls being screeching attacking sky-demons that I read 'dealing with humans' in the sense of them 'dealing' with us the way Mafia operatives would.