I have no dog in this fight. I'm not British. I don't live in Britain.
I am certain that racism exists in Britain. But I don't think I've been anywhere that racism doesn't exist. More to the point, I don't think I've been anywhere with less racism than Britain. I've been to every continent but South America and Antartica. Perhaps Brazil is the utopian ideal you're using as a baseline? I saw racism in India, in China, in Canada and the US, and in my native Ireland.
There isn't much racism in Ireland, but then again, there aren't that many visible minorities, and until recently we've been blaming all our ills on Britain... Oh, bother. Well, apart from the Troubles, Cromwell, the Famine, what has Britain ever done to us?
Pythonic (half-)witticisms aside, I don't think your statement is useful. There are racists in Britain, but my own anecdata is that it's mostly a place with relatively good integration, certainly better than what I saw in the US.
Finally, take a look at the current cabinet. They may be a shower of haters, second-raters, I'll-pay-for-it-laters and the like (Braverman is my current least favorite, but only because Priti Patel on a break getting her venom glands upgraded, but they certainly cover a fair gamut of skin colors. (Though no one of East Asian decent so far as I know)