Between £13 and £20 an hour if you employ my brother in law. He has a relaxed attitude to his commitment (4 hours of cleaning at £10 an hour), hence the variable rate.
And being a student his timekeeping is changeable, often arriving at the weekend to do what he failed to do in the week when he was too busy “relaxing”. Or I find my MIL has been doing it (you can tell, she’s good) and then get made to feel guilty because of all the time she spends doing things for us (mainly childcare, which is unpaid).
Luckily for the OP I don’t live near Bristol, instead inhabiting that space between a rock and a hard place.
(Less ranty answer: we used to pay £12.50 ph 3 years ago in Manchester, they supplied cleaning products.)