Comment by Wintamute

It's not an American import, or absurd to have an identity composed of both a nationality and ethnicity. Really, it's up to the individual - there are many 1st, 2nd and 3rd generation immigrants to the UK or Europe that value their cultural origins and ethnicities. Absolutely those people are British, but many, if not most will not wish to erase their heritage for the sake of 100% assimilation into the host culture.