The new Oakwood centre in Wokingham (30-odd miles from London) has a pretty good training set up.
Lots of fingerboards with pulleys set up, 2 boards, a lattice board that can be set at various angles. Separate extensive area for circuits. Mostly quite quiet at the weekends when I've been. Let down at the moment by the fact that the campus board doesn't have rails beneath for feet on campussing. No aircon but big fans and open loading doors.