Hi, the more hours the client wants the less they pay, a big customer 70hrs plus will pay alot less than a customer who wants 10hrs a week, my customers range from 100hrs £7.65 to 4hrs £25 per hour, talk to the client find out as much as you can, be open and honest, if they like you or your sales person and that price is ok they will use you, phone them back after the quotes gone in, offer a discount on prompt payment, if I got it right every time i'd be very rich, its trial and error.
I dont think it matters what part of the country you work, most companies pay office cleaners £5 to £6.50 per hour
regards
Paul