Hi,
There are plenty in SW.
You can check out yoga haven in Clapham
newcomer link: http://www.yogahaven.co.uk/london/prices-schedule/
[nonactive] They have a flow style yoga in hot temperatures. and also at room temperature. i think the hot-styled one is more frequent however.
& another for ashtanga&flow style yoga in Clapham (as well as fitzrovia)
newcomer link: http://yogawithme.co.uk/south%20london%20yoga%20classes.htm
[nonactive] & another hot yoga in clapham. it's a hot power yoga but it looks like bikram without the name.
newcomer link: http://www.hotpoweryoga.co.uk/
[nonactive] &then just regular power yoga in parsons green.
newcomer link: http://www.thepoweryogaco.com/poweryoga.html
[nonactive] I also came across this blog that you might find interesting. yogilondon...it's really good for yoga practitioners in london and events/new studios going on in the city.
newcomer link: http://yogilondon.com/
[nonactive] hope this helps!!