http://www.waitrose.com/food/productranges/chocolate.aspx
Toddy, cacao I think is cocoa solids, the solids and the butter mixed make chocolate, I think.
The 100% stuff as demographic points out is rank, but I think the cocoa butter is the nasty bit for us humans (In excess of course). I just made hot choclate and it really was as bitter as black coffee, milk and honey soon sorted it out though.
There was a program on Willys wonky chocolate or something where he was promoting it and using it in recipes.
Toddy, chilli chocolate is fantastic, there is a guy on Arran that makes some fantastic stuff, James of Arran or something, its great