In reply to CurlyStevo:
High Rocks is the best bouldering and routes in the area, but can take a while to come into condition. The other issue with High Rocks is access - currently £10 per day (or part day i.e. evening) which is a bit too pricey for a one-off visit but £40 for an annual season ticket is ok if you can get there often enough to make use of it - and it's anyone's guess what the weather will do during your time in the area (or the preceding month or two).
Stone Farm and Bowles (particularly) dry the quickest, Bowles is more extensive than Stone Farm but both have some good routes and problems in your grades. If the weather is good enough there'll be people out to join in with at most of the main crags most Tues, Weds and Thurs evenings during the summer, either bouldering or top-roping.