This is just arrogant. The pub staff clearly need some education!Just wanted to thank @lisacp for the thread and testing solution. In our local pub my husband ordered me a diet coke, it came and tasted odd. So I used your test tip to discover that it was 'the real thing' and so took it back. Explained we had ordered diet, barman said "surprised you could tell the difference" so I explained about test and diabetes. They gave me a replacement sharpish.