Friday 22 February 2008 2.32pm
There are several discussions on this subject already, however most are hidden in threads about the shortcomings of other gyms, so you're perhaps forgiven for asking!
Personally I go to Cannons on Cousin Lane, near Cannon Street station - which, though it's not in SE1, is walking distance from London Bridge. It is large, with two pools, two studios, a boxing studio, a yoga/pilates studio, a cycle studio and squash courts. It's got a good range of equipment and loads of classes. When things are broken they fix them quickly and efficiently, and there's a feedback section on their website which - in my experience - actually gets acted upon. The staff are mostly really lovely, too.
There's also a spa with beauty salon, and a cafe run by the Bagel Factory
The only minor annoyance is that they are only open 10 till 6 at weekends, which may or may not be an issue for you. Also they let parents with children use the swimming facilities at weekends, which is fair enough but can be annoying if you're after a quiet swim.
It's expensive but have a look at whether you could get an affordable deal via PruHealth health insurance, as I do.
I have no connection with either the gym or PruHealth other than being a happy customer.