I'm envisaging a scenario now where decolonisation is improbably, implausibly peaceful. Home Rule leads to the Dominion of Ireland, there's no partition but instead a Dominion- then Federation- of India, the Mau-Mau are pre-empted by some sort of Dominion of East Africa and so forth.
The chances of any one of those happening are slim, let alone of all of them succeeding, but just go with it.
In that timeline, I think it's plausible that the modern UK is more reactionary and racist, not less. Even more so than in our timeline, there's no reckoning with India- it's a slow retreat, no Confrontation, no Mau-Mau, no Suez. In fact, if things like the Indian Federation fall apart that's proof that Britain kept 'their worst impulses' in check, or whatever. The empire is, even more so than OTL, seen as something to be proud of.
I wonder if there's something there?