In reply to jonny_098:
Most of the calshot routes are 11.5 meters high, the comp wall is 15m, there's a reasonable sized bouldering wall. Calshot can be a pain in the ass to get to due to it only being open in the evening on a weekday (6:30-10:00 although it's open during the day on on the weekend).
The city's other indoor wall, st marys, is small but good for a quick training session (especially if you live a 10 min walk away from it, although you'll probably end up in halls which is a bit further away, the unilink buses will get you there easily enough though).
Swanage is awesome, I'm not a massive fan of Portland (don't like bolt clipping) both of which are between an hour and a half and 2 hours drive from soton. Dartmoor is also possible for a (very) long day trip.
I've just left soton for a while, I'm off to LA for 6 months courtesy of soton uni so will be back in Dec. I've never climbed with the uni club so can't comment on that (nowt personal against them, I'm sure they're a good bunch but they do tend to overwhelm wherever they go with sheer numbers so I generally steer well clear). As rich said they do calshot on thursdays, st marys on monday and afaik they do weekend trips every other weekend - SUMC members feel free to correct me on that one though.