Does this job sound fair to you, or is it exploitative?

[BrickWasp]

Mum with a 1 1/2 year old baby looking for a live in nanny 6 days a week.
Working hours 4pm to 11/12pm (while mum works evening shifts)
Double room with all expenses paid at home (Wifi, gas, electricity, food, etc...)
Au-pair has the whole morning free for another job or for studies, she has to take care of the baby from 4pm (sometimes 5pm).
Cameras in the house on 24/7 with the knowledge of the au-pair.

Is your friend telling the truth about the 'job'? It seems insane that the purported 'employer' would think they could get away with this.

AS to your friend taking it then reporting. They wouldn't need a contract to prove the illegal conditions, because presumably they'd have other records (text messages or whatever) where they've been discussing their care of the child with the parent, and no pension nor payslips. But I'd worry about the work conditions in the meantime, and that the 'employer' wouldn't have the money to pay them the back salary once it goes through court - it might be that they are avoiding a paper trail because they fund their lifestyle through something illegal, or that they're broke and only have the property.

If the 'employer' thinks the room and board is so valuable he/she should get a lodger, and use that income to fund the 'nanny'.

You want someone to care for your children every day for free in exchange for a room in a house where they will be filmed 247? Are you absolutely mad???

HMRC have a set amount that employers can offset for providing housing. I think under a tenner a day iirc. Therefore this "employer" would be paying massively under minimum wage and could be subject to a massive fine. Id report to HMRC if I was aware of a situation like this.