The checkout operator had paused to alert a supervisor of a problem with her till. The lady in front of me had just loaded her shopping onto the conveyor belt and the customer being served was waiting to pay, I presume. I was happy to wait and was rather enjoying the time to stand and observe those around me. (Those conversational gems might crop up, one never knows). It was a busy Monday morning. Several tills were unmanned, clearly something the hovering supervisor was not happy with. He signalled for a young lad to man the till next to me. It was of no use to me of course, it…