you could try serene spa in balham high road ( www.serenspa.co.uk
) professional massage, extras available depends on the lady, they have 3-4 per day, £40.00 per hour, charmaine, vicky, maria, all do HE + strip.
Indulgence in plough road clapham junction, proper spa sauna steam room, quite a lot of the girls do extras. Earls court is a good bet as there is about 6 shops to choose from all around the station area.
Good luck and let me know if you see any good ones.