In case anyone else is interested, I have been a few times to a new yoga class on Tuesday evenings in Secker St SE1 (Xenia Centre) which I have found great personally (having not practised yoga for years and having looked for some time now to find a local class that fitted around my other commitments).
The style of teaching seems to accommodate all abilities/levels of experience.
I have no connection, other than my attendance at the classes, but do want to support the class. It's often fairly quiet as I don't think many people know about it yet. Selfishly, I really want it to continue so I can keep attending!