»In 2018, it emerged that under the "hostile environment" policy, victims of modern slavery and human trafficking in the U.K. had been jailed in breach of the Modern Slavery Act 2015, and that several had been deported by the Home Office.«
[0] https://en.m.wikipedia.org/wiki/Home_Office_hostile_environm...
Source?
> without your passport you are mostly stuck in an unfamiliar country
Without your passport you just go to your country's embassy and get a new one. Or if that's not possible because your country doesn't have them, claim refugee status.