Donair
I can give you a first hand experience of GA at East Midlands, although bear in mind my current experience levels are that of someone approximately half way through the PPL.
I've had to hold for a max of about 10 minutes, and that was during the lunchtime rush so it really is quite bearable. During circuits I would average about 6 in an hour. Once I only got 3 in, and once I managed 7.
Everyone I come across is very friendly, but there doesn't seem to be much of a club. Having said that I have very little to compare it with other than a trial flight at Derby and Tatenhill. I picked Donair because it was fractionally cheaper, fractionally closer to home but more important to me was that I got on well with the instructor.
Obviously I have no idea how much it would be to base an aircraft there, or if any shares, etc. are available.