In reply to rob514:
I spent many an hour down St Mary's before they finished the Uni wall.
Great if you like top roping and mediocre bouldering, but cruising the same route repeatedly will keep you fit.
Calshot is literally the coldest place on earth - worth the trip on a chilly Wintery Wednesday evening though But pack the Down jacket!.
Uni wall is ok - quite small but a lot going on.