In reply to nrq:
I normally go to London or MK
There is one at Hatfield in the uni, but it is very limited.
Arch North, is pretty close if you're in a car (about 45mins), and that wall is awesome - they do courses and intros and all that stuff...
or you could always join Scouts/explorers/Network and wheedle you way into their block booking of the brand new wall at priory school on wednesday nights
...or join me on my training wall in hitchin - although that might be a bit much for a novice...