It may be January, but that's no reason not to get climbing outdoors. The crag at Brean, just south of Weston-Super-Mare is an ideal cold weather crag, it's a veritable sun-trap - climbing is possible pretty much year-round. Although there are many trad lines to choose from, the rock isn't really suited for placing gear, so it's best to stick to the sport routes on offer.
I don't think there's anything easier than a 6a or harder there, so it's not a crag for the beginner! The best lines seem to be 7a/b and harder... a great excuse to get down to the wall and start training!