Those groups are what have made the British people, and the key also being that they are closer in a lot of ways. We had formed a monotone culture pretty much. White British people have become a minority in their own capital city in a matter of decades. That's insane. These policies have been carried out with evil intent and we're seeing the results more and more frequently now.
It's amusing that you don't seem to know your capital at all. London used to be the centre of an empire, like it or not, and the multiculturalism, like it or not, is not something new.
Nor is the fear for it, though.
It was never pretended that the non British people were part of the British race then. Never have we had immigration on this scale, not even close. We had a lot when Jews were seeking refuge over 100 years ago. But now British people are a minority in England's capital city, which is insane. When the start of the transformation was happening in the 50's and 60's, people were complaining then to their MP's, speaking of being the only British people left in their street. A large majority of people agreed with Enoch Powell's 1968 speech, which would have meant repatriating the immigrant population if he'd become Prime Minister. Lots of immigrants also wanted this, as they'd have been rewarded with £1000 each. Both sides of my family have come from London, they say it's been completely rearranged. Pretending it's always been this way is ludicrous, but what should I expect from a parrot like you. Corrupt politicians spew the same tripe all the time.
What race is this?
Well in "English Speaking People's" by Winston Churchill, he speaks of the British race. No one really knows what race is though. I'd imagine though he's speaking of the English people made up of a few different types and had basically assimilated over the last 1000 years.
I believe he meant the English-speaking peoples, so the Commonwealth and pretty much any colony you lot had at some point in the past. Basically, anywhere where English was ever the official language. At least, that's what the books referred to, IIRC.
In other words, Churchill most certainly included what you refer to as the "non British people" in his "race", actually about 800 million of them after WWII, because they were all allowed to live and work in the UK without a visa following the aptly-named British Nationality Act in the late 1940s.
There have been a number of attempts to limit this since then, of course.
Interestingly, the freedom of movement in the EU means that about 430 million or so people could theoretically be stopped at the borders once Brexit is complete but that would't affect the commonwealth. It also wouldn't affect the status of refugees under Article 14 of the UN Declaration of Human Rights.