I believe you. There are racists in Britain. There are all manner of bigots there. Between people who thought I was fair game for being Irish (I've heard all the potato jokes I promise) to those who don't like me for being Jewish, I fully believe there are bigots.
But again, racist compared to what? Do you have an example of a much less racist society? I.e. I'm not claiming it's ok. But the phrasing 'deeply racist' irritates me. It's a fine way to dismiss everything good about the place.
That said, some of the recent stuff in the Graun about black school children being strip searched is enough to make your blood boil.