Given that it is perfectly legal for me to give her a glass of wine to drink at home (and has been since she was 5)? Was told in Tesco today that I couldn't buy wine as DD1 was with me. DD1 is 19 but had no ID on her, as we had just nipped out for a few bits. Cashier finally called a manager, who gave me the Spanish Inquisition, and finally said "OK, I trust that you aren't going to give any to your daughter." 

It's not like I was buying WKD - I had a bottle of Champagne and one of an expensive Bordeaux!