You mean to say you haven't made £50 million off amazon.de yet, you msut be going wrong somewhere. LOL. It does seem ludicrous that something that looks so simple is almost impossible to sort out.
BAL, I am very very surprised HSBC could not help you , Did you ring them or go into a branch, I would try them again as it may have been the person you were talking too did not know what they were talking about