Coffee Appreciation

Apologies if this has been asked before but where in London can I get a decent soy coffee?
Ive been to quite a few well respected places and with the exception of sacred (who are a bit hit and miss on the actual coffee front) nobody has managed to make me a soy coffee that didnt curdle the milk. Am I asking the impossible?
I was hoping to try out Kaffeine today as I know they use bonsoy which is supposedly much more resistant to curdling but they were shut, does anyone have any other suggestions?
My quest for good soya coffee continues...have you had much luck clockwork_killa?

Two places which always get it right for me are Bermondsey Street Coffee and Love Walk Cafe...where else is there?