Denim in South Bank has the most yummy hot chocs! And they're kind of novel too.
Comes out with just choc and marshmallows in a cup and the hot milk (soy in my case) separate ready for you to pour in and mix up.
I had soy chai latte here the other night though and it wasn't half as good. Tasted just like warm milk with honey.
I'll be sticking to the hot chocs!