Can anyone recommend a venue for yoglates In central London which is not linked to a chain of gyms?

These guys are in central london but don't have any reviews on Wahanda so not sure how good they are: http://www.wahanda.com/place/marcophysio-central-london/
Alternatively, Qi Yoga in Clapham gets good reviews and might be worth the extra trip: http://www.wahanda.com/place/qiyoga--clapham/