I don't see why anyone would want to do that!
ASgencies to me conjures up the image that they will send anyone in to cover the job,Everyone knows its a sales environment and commission based. Plus who would want to pay a fee to agency and then £8ph cleaner.
The agencies terms and conditions make me laugh, they say in no uncertain terms that they will not be responsible for anything going wrong.
I think cleaning company's are much better bet, if u hire in a cleaner one on one or through a professional cleaning company then you know the book stops with the manager.
agencies for cleaning always struck me as a mugs game.