Funny, after talking about this yesterday I got an email from Jasper and they have a fair-trade organic drinking chocolate now. They also have fair-trade organic coffee that I order online from them.
About to put a choccy order in for winter mmmmm.....

ETA - They've added fair trade sugar to their stock as well but I think I'll stick with the CSR organic.

ETA 2- All the fair trade drinking chocolate is out of stock but