Sorry, I get what you mean now, I don't know why I didn't read it like that.
Mystery I googled "pre war population make up UK" because people always make your statement or something similar and I wondered how accurate it was. IDK how accurate [URL="http://www.migrationwatchuk.org/briefingpaper/document/48"]this[/URL] is, but I recognise that migration watch gets quoted on the BBC occasionally so possibly somewhat reliable?Britain (England especially) has been a multicultural society pretty much since forever
If I was guessing, I'd suggest your statement was more accurate for London and large port towns.
In terms of immigration I just don't see the current numbers as feasible to absorb, the infrastructure simply isn't there, regardless of any other argument about it.