In reply to Oo:
Both the current Bristol walls are within a mile of each other, so location shouldn't really be an issue. Plus, they both have very cheap memberships compared to most places (isn't UCR £1?). UCR is the only one for roped climbing, but TCA is great for bouldering.
The one confounding factor is the new wall that is due to open somewhere in the south of the city in the near future (Bedminster?), but obviously no-one can comment on that yet.