Just been to Sainsburys for lunch, and out of the self serve tills where I paid came a coupon for a FREE 5 pack of this new gum by Wrigleys worth £1.99
I walked back in, picked a pack up and went to the till with the voucher, and it reduced the £1.99 to £0.00. I even kept the coupon! Might try to use it tomorrow too!
Go and buy something from the self serve tills and se if you get the same