So sorry about your experience Andrew. It is sadly indicative of the at times utterly useless staff at some Aldi Stores. As far as the law goes the staff member and the store manager are BOTH very wrong. You did what was required of you to legally do, and were refused. Either this pair need to be retold their company's legal responsibility regarding the sale of alcohol, and required proof, or be dismissed for bringing that store into disrepute. The other customer was quite right too. If I went into that store with my young daughter to buy wine, and was asked for my id, I would legally expect to be sold it after it's production. Dreadful. I do hope that this will be an eye opener for you, and that you stay away from that particular store, if not all Aldi stores. There is one free course of action open to you and that is to go to your local council and complain under the sale of good act. I am sure they would be very interested. Good luck in the future.