My 3 yr old goes to Little Nippers at Trinity Hydro and it's fab. No more than 5 at a time and her swimming and confidence has come on amazingly well.

Have you checked out Trinity Hydrocenter? Not sure if they do non parental classes but they dont have more than 5 kids in a class...

My 3 year old son takes lessons at Clapham Leisure Centre: http://www.better.org.uk/leisure/claphamleisurecentre They are proper lessons - without parents in the pool- and the kids all seem to love it and learn a lot rather quickly.

Hi - my daughter has just turned 3 and I am looking for recommendations for swimming lessons. I would like a relatively small class where mum's don't have to go in (am about to have no.2) and where the pool and changing facilities are half decent. We live in Clapham South and the location would need to be walkable/tubeable from there. Thanks!