I think what I was trying to say is that if your mum wanted to employ someone direct , say from a card in a shop window, she would pay less than if she used a firm that advertised. The problem there is if she is vunerable it would be better to use a firm that has CRB checked cleaners and are insured but its more expensive. Have you contacted Age Concern, they employ good cleaners for the older generation and your mum can pay the cleaner herself.