In reply to Jim Nevill:
We went to the Cambridge one recently. It was quite fun as a one-off - it'd make a good office outing, for instance - but it's definitely no substitute for a regular wall.
It's a very novice-oriented setup, as well - no rock shoes allowed, crappy wall harnesses only, and you have to get a member of staff to clip you in and out of each line with a lock-and-key carabiner...
Post edited at 12:06