Had some experience with Cambridge Helicopters and can certainly recommend them in terms of thoroughness and knowledge of their instructional staff. Plus the benefits of learning at an airfield with full ATC facilities, and flexible controllers used to the bizarre requests often given on training flights... Know they have had some females through on their PPL courses in the past.
Recommend a visit to all the schools you're considering. Try and chat to some of the people learning there at the time as well as the instructors...