I Want My Yoga

Since moving jobs in London, I haven't been able to get to the yoga class I've been attending religiously (in a non-religious way, you understand) for over four years. I want my yoga class and I want it now, or at least before stress starts building up and I start chewing my toes. Again. Someone help me find a new yoga class soon in central London that's not in a gym which costs a flexible arm and a bendy leg to join.