I heard today that a family at school is paying their nanny (from a non-European country) only £250 per month live in. They claim that they are sorting out a visa for her, but she has no idea if they're telling the truth. They are also becoming more and more demanding of her and adding to her workload all the time. She is feeling trapped and they tell her she could be deported (actually she probably could be). Another nanny at school has befriended her and has offered to go with her to Citizens' Advice, but she's reluctant to go. We live in a pretty affluent area of London, so these people are unlikely to be poor.
Is there anything that can be done about this situation? I don't know the nanny or the parents myself, but have heard this from her nanny friend, who wants to help her.