There most certainly is! If you like dark chocolate, try Lindt 70% cocoa chocolate, it's yum! There's also Moser-Roth Chilli flavoured dark chocolate, which sounds a little weird but it's very good, you get it from aldi.
There are "milk" chocolates available like Sweet William's (from the health food section in most supermarkets) white and milk, and BonVita (from health food shops) rice milk chocolate, which is a lot of people's favourite
There's many many many more, you just have to do a bit of looking and reading labels, a lot of dark chocolate won't have milk solids and if it does, it's not really dark chocolate is it?!
I'm thinking we should take back the word 'chocolate' as in ancient cultures it didn't have milk in it! -nod-
Hope that helps