Meridian do one with no added salt or sugar and I know it's available from Holland and Barrett. We buy the Hazelnut butter from the same brand. They also do a cashew nut one with no salt or sugar. You might be able to get it at some supermarkets too, but I've never looked.
you could try a peanut paste (100% crushed peanuts), try an ethnic food store. we checked out loads of peanut butters but most seemed to have sugar, salt or palm oil added - although will check out the Meridian one. thx