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In my opinion they are the darkest due to heavy neolithic ancestry. Specially when It comes to hair and eye color they are darker than scandinavians, continental germanics and (non-balkan) slavs.
The only question would be if Hungarians are darker or lighter, but I've come across more naturally blonde and blue eyed hungarians than brits, whose women are almost unifomly bleached blondes, and most chavs I've met have pitch black hair. Brown eyes are quite common among them too.
Guy in the far right is typical british med type.
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