In Europe, cars have to be type approved for towing. This approval sets out the towbar mount points so that third parties can manufacture and fit the appropriate brackets. Only a small number of cars, such as the Ford Ka, aren't type approved for towing, and I believe that there aren't any kits manufactured for these vehicles. To tow with one in Europe would be illlegal. The Ford Ka is similar in market position to the Toyota Scion - ie trendy motorised shoppong trolley
PS my compliments to you on posting in such a lucid and logical manner whilst under the influence!