We visited a new Tesco store yesterday and needed something for Debbie's shoulder pain. The in store pharmacy suggested some pain killers and a heat patch which contained no drugs. We found one but when we tried to pay for it at the checkout they refused to sell it because it wasn't on file and confiscated it. Not taking no for an answer, I went back to the shelf, took a picture of the product and the price, picked another one up and took it to customer services.
They still refused to part with the goods untill I showed them the picture and then with a huff they relented.
They must have forgotten that "every little helps"