because many of them don't live in areas where there are toilets or refuse collection facilities."
There are barely refuse collection facilities in Britain these days, the Roma may be shocked to find things are worse than wherever they came from. independent.co.uk/news/uk/politics/battle-of-the-bins-defra-stats-show-fortnightly-refuse-collections-increases-recycling-8434239.html
As for public toilets, I've lost count of the number of times I've seen people have to "go" anywhere they can, but that's being somewhat addressed now by the installation of portable loos in strategic spots in Wrocław (little blue cubicles, very basic but better than nothing if you need to urinate). But go to London on a Friday night and you'll pass drinkers urinating in the streets, and not just the men. Frankly, I'm taken aback that Romas aren't disgusted with the lack of public loos in the UK!
Probably not, because one figure suggests that up to 300,000 Brits are leaving every year, so there's a place for them.
Some expat Brits, apparently mostly from Spain, are trying to return and buy back in to the UK, and finding it very hard after the rampant HPI seen in many areas. But yes, many are clearing off, they've had enough.