Well you certainly have lots of choice at Biggin.
If you want cheap flying go to America or somewhere further north.
As for good, look at all of the schools and make your own judgement. I would say they are all good but you must choose the club or school that suits your requirement most. Talk to the instructors, look at the planes ask to talk to the students. BTW any school should let you do all 3 of the above. If they don't....
The PPL is a long journey, an afternoon spent looking around and making up your mind and finding the one you are most comfortable with will pay off long term.
Whatever you decide to do good luck and congratulations on making the decision to learn to fly.