Roms will be gone post Brexit so better get used to it.
It was a subtext in my irritation at Brexit that we were cutting our own dicks off slightly there. I mean, I mostly punt Brits to be honest, as I find the language barrier between me and many EEs (or whatever nationality you like, fill in the blanks) to be a turn off. But it was nice to have the Roms around to keep a powerful drag on punting prices among the British girls. There's definitely been a hike in the average cost of a London booking in the past year or so, sadly. And while some might point out that the price of everything is going up, I'd reply that the cost of living is going up for me too, and it ain't going to be covered in my job's pay cheque, that's for sure.
OTOT, while there's language schools teaching English, there'll be scams where working girls pose as students, get a visa to come over, and then earn some £££. Or some other variation; frankly if SPs from China or other non-EU nationalities can get here then so will the EEs. Plus, I wouldn't be surprised if a lot of these 'Brazilians' were a lot closer to home than Latin America...