The most likely candidates are places like Bradford and Birmingham, which are still - according to wikipedia - 60%+ white british, that's without even considering british asian or other people born in and native to the UK.
Again, sorry, I can't find any sources to support your facts here, maybe I looked in a different place to you, so perhaps you could share your sources?
I’m not taking sides on the wider argument here, but I think it’s you who should check your sources? Copy pasting direct from wikipedia:
> The city of Bradford is 45.8% White according to the latest 2021 census data, with the White British population being 40.5%. 45.3% of the city's population is Asian, primarily from the Pakistani community
https://en.wikipedia.org/wiki/City_of_Bradford
> According to figures from the 2021 census, 48.7% of the population was White (42.9% White British
https://en.wikipedia.org/wiki/Birmingham