Can anyone recommend a pregnancy yoga class on a Tuesday or Friday near Clapham or Wandsworth?

YogaMama in Putney. To be fair, I haven't been there. I did some graphic design work (flyers, magazine ads) for them and know everyone to work there to be very professional. They really seem to be top-notch.

I can suggest you look on the BIrthlight website http://www.birthlight.com as you can search for teachers there and they are a good governing body, good luck
Penny