Many thanks for your replies.
Yes, I did decide on the Bostock and Chandler maths books in the end and am very impressed as they help ME to understand the maths as well as my daughter. (Maths was always my weakest subject). When she was at school they used books that I could not understand - too many pretty pictures and not enough explanation!
Unfortunately, I am not in a position to pay for private tuition at the moment, but I take the view that whilst I am teaching her, I am improving my knowledge too, which can't be bad!
Thanks again
Rosemary