NPPL
There is lots going on at White Waltham though I have no idea how good any of the instruction is. it always seems like a busy club with a good clubhouse. If you are doing NPPL perhaps something Microlight might be cheaper. Popham (not to far) Old Sarum and Sywell have non GA types. Im sure there are others, I think finding somwhere you like and a good club atmosphere is half the battle. I fly a Sportcruiser and live SW side of London if you fancy a flight just PM me
Pete