I get that but Tesco would not refuse to serve an Asda employee but sell to Sainsbury's ... so if they are willing to sell how could it be allowed to sell to someone else for less but reject our offer , if was the other way round and they offered more then it could be justified as a business making profit is the reason for selling to one but not the other
They own his registration. They don't have to do anything. It's theirs to do with as they please.