Hmm... I was doing last minute Christmas shopping today in Sainsburys, and at the counter the cashier asked if I was alone. Not thinking, I replied "no, I've got someone to help me with the packing" (my 16 year old sister was having a drink in the café, and I meant taking things to the car rather than packing). She said that "it's not the packing I was on about, it's the alcohol". Then she took my ID off me, wrote down my name and address on a sheet, and carried on as normal. Does anyone know why my details were taken?