This weeks Co-Op offers included 20p off milk, so I added it to my card. Went to the shop, got the milk, scanned it, scanned my Co-Op card, till came up with the offer price. I then realised I’d forgotten to pick up my bank card, had left my phone indoors on charge, and the self serve tills were card only…….luckily I had a bit of cash in my pocket so I called a staff member, explained the situation and said I’d have to give him cash on the main bank tills. He voided the transaction on the self serve and we went to the main bank, where he scanned the milk and my members card, then asked for the full price. I said I had an offer on my card but he repeated that the till was showing the full amount. I said maybe it was because I’d already scanned my card on the self serve till. Gave him the full amount and came home. Checked my account, yes, the 20p off offer is now showing as redeemed, even though he voided the self scan transaction and I did not actually use the offer.