By British you really mean white right? the government disagrees about whites being a minority by the way.
According to the 2021 Census, 81.7% of the population of England and Wales was white, 9.3% Asian, 4.0% black, 2.9% mixed and 2.1% from other ethnic groups.
www.ethnicity-facts-figures.service.gov.uk
81% definitely a majority as far as I know (damn useful this Math's O Level has been)
Also define white? English? Welsh? Scot? Polish? Scandinavian? how about mixed race? what sort of genetic percentage has to be European Caucasian to be classed as white? My wife has a Scouse Dad and a Filipina Mother, is she white or a fuzzy wuzzy (she cut my balls off if said that to her) My children are one quarter Asian and three quarters white though they look much more like their mother than me are they white enough for you?
What about my grandkids, they take after my daughters (their mothers) but they've only got one eighth Asian in them, hell my granddaughter is half Paddy to boot are they white enough for you?
Humans are a single species and we have far less variations than many others, look how different dogs are to each other.Careful, now