Having looked about, I settled for Old Buck, where I felt at home. The deciding factors were:
A great set of instructors with a wealth of experience.
Landing fees/membership/resources free (including headset when you pass)
Proximity (diesel is NOT cheap these days).
It's possibly the case that training is cheaper elsewhere, but on balance I'm training at an at airfield which I'm happy to be, and I've had no reason to regret the decision - far from it. I think this is an important factor, having heard various stories of screaming instructors etc ruining the experience.