I’ve been punting in the UK for almost 9 years and have never been turned down by an escort. I never tell them I’m of south Asian background on the phone either. From my discussions with WGs about clientele post-punt, I think in the UK at least a third (more in certain parts) of punters are south Asian, which is likely due to a lot of younger south Asian men being seen as conventionally unattractive by civvie girls and older men being in sexless arranged marriages. Odds are, if you see a WG here, she’s probably seen another South Asian that same day.
No black rules are a little more common but that’s a lot to do with societal stereotypes of blacks among Eastern Europeans (either about penis size or how “rough” they are) and also the fact blacks don’t punt all that much generally.
If you have that much to spend and are traveling all the way here, you might as well get an English girl for the experience though rather than a Romanian. There’s a UK porn industry (fake Taxi, Killergram, Splat Bukkake, etc) that effectively functions as advertising for English escorts and naturally most of them are happy with filming.