Err.. you do realize that the immigration debate in the UK for the referendum was due to EUROPEAN immigrants to the UK from the EU? The UK had to cut non-EU immigrants to try and limit the overall number of immigrants (As EU immigrants don’t need any permission and can walk in)? It’s got nothing to do with “now that’s enough Africans”
Okay, so phrase the anti-competition reasoning slightly differently. It’s a perfectly reasonable position to hold.
Cronos is correct the blacks in question are from the British Commonwealth aka from African or Caribbean ex British colonies.