In reply to haw4th: Hey dude - I'm another Oxford local that despairs about the lack of climbing. There are quite a few of us. Get to know people and there will be someone driving somewhere most weekends.
OUMC are a good bunch, as mentioned, though if its bouldering and sport climbing you're looking for they won't always be going to your ideal crags.
The thing to do in the UK is trad climbing, as I'm sure you're aware. If you're not used to climbing everything on gear, get used to it. All the best routes are trad climbs, not that much is bolted, so to get the most out of British climbing you've got to get your cams out.
That said, bouldering on grit is fantastic. Get yourself to the Peak district asap!
I am very psyched at the minute but slightly injured, so won't be doing anything for a month or so while I heal. Shame. But at least that means if you want to go and are desperate for a pad and/or guidebook, you could swing by on the way and borrow mine - I wont be using it.
Probably see you around soon enough