Your media interview doesn't start when the reporter asks their first question. It starts the moment the phone rings, the moment you walk into their building or the moment they walk into yours. And the interview isn't over when they say thank you and ask you how to spell your name. It's over when you've hung up the phone (and confirmed that you've hung up), when you leave their building and hear the door click behind you or when you see the journalist driving off into the distance... This unguarded, 'hot mic' moment of Sainsbury CEO Mike Coupe singing 'We're in the Money' is now part of his professional legacy. And it was totally preventable.