MadamePlatypus, I am happy to disagree.
I believe market forces work far more efficiently than you think - because EU aupairs are free agents, they are not here illegally, and UK is open and transparent. Families have no special hold over such aupairs. And if the pocket money becomes too low for the number of hours, at some point it becomes more economic for the aupair to work as a live-out cleaner (£7 to 10 per hour market rate) and fund her food and board out of her cleaning wage, than to stay in her role.
As for the issue of legislation, that has not been taken up by the European Committee for Social Cohesion ... read more:
"3. At the outset, the CDCS would like to stress that the employment of an au pair is intended primarily to promote cultural exchange between young people and very rarely leads to situations of domestic slavery, despite the occasional cases of abuse that have been reported.
The European Agreement on Au Pair Placement dates from 1969. It contains provisions ? now obsolete ? on the relations between the host family and the au pair. In view of the small number of ratifications (five member states), the CDCS began by considering whether it would be worth revising and updating the Agreement. The replies to the questionnaires it sent to all the members showed that this question excited little political interest and that very few states would ratify the Agreement even if it were altered."
The European Agreement was only ratified by 5 states, not including the UK.
I have no doubt that exploitation of aupairs does occur, but I would like to think it is not widespread in UK. I don't anyone who uses aupairs as cheap childcare. No person I know who is coming back from maternity leave has ever ever considered an aupair, as opposed to a nanny, as an option. Aupairs by-and-large look after school age children, and the hours are automatically capped by virtue. There is no cultural mindset of using aupairs as cheap childcare.
And believe me, I come from a country that uses Philipino nationals in the very way you describe.