Davidraphael, the discussion of leather conditioners has many differing opinions, but I've always had great success with 100% pure Neatsfoot oil. It's recommended by many different leather tradesmen, and I like it over synthetic conditioners with stuff that gets close to my skin. Note that it may darken the leather slightly, and you'll obviously want to keep it off any cloth. A tack shop, feed store, or quality leather store should have the stuff, but I cannot recommend any company in particular in the UK or Germany.