The truth of the statement that most "black" people in the UK are descended from ... rather depends on the applicable definition of "black". In particular, people from the Indian subcontinent are sometimes referred to as "black". (For what it's worth, many people in Britain with Indian ancestry were brought up in Africa so could claim to be "real" Africans...)
I don't think it makes much sense to categorise people by skin colour. An Afro-Caribbean doesn't in general have more in common with an immigrant from Africa than with an immigrant from Syria or Hong Kong.
People with a different skin colour certainly do get discriminated against. However, if you really want to get discriminated against, try dressing in the wrong way and speaking a foreign language or with a foreign accent. In general, people get judged by their clothing and the way they speak far more than by any physical feature.
Perhaps it doesn't make sense to generalise across the UK, either. Afro-Caribbeans are much more common in the London area than elsewhere. Only in Bradford has someone made me feel like a foreigner by speaking to me slowly in Hindi/Urdu and rolling their eyes when I fail to understand. (Quite cool, I thought: I approve.)
I don't think it makes much sense to categorise people by skin colour. An Afro-Caribbean doesn't in general have more in common with an immigrant from Africa than with an immigrant from Syria or Hong Kong.
People with a different skin colour certainly do get discriminated against. However, if you really want to get discriminated against, try dressing in the wrong way and speaking a foreign language or with a foreign accent. In general, people get judged by their clothing and the way they speak far more than by any physical feature.
Perhaps it doesn't make sense to generalise across the UK, either. Afro-Caribbeans are much more common in the London area than elsewhere. Only in Bradford has someone made me feel like a foreigner by speaking to me slowly in Hindi/Urdu and rolling their eyes when I fail to understand. (Quite cool, I thought: I approve.)