The boss of UK’s second largest supermarket chain Sainsbury’s apologised for singing as he waited for an interview with ITV on his company’s £13 bn merger deal with the third largest supermarket chain Asda. Mike Coupe said he did not know the microphone was on when he began singing low the first few lines of We’re in the money from the musical 42nd Street and raised the pitch when it came to Let’s send it, lend it, spend it. Coupe, an accomplished musician, said he was trying to compose himself before the interview by humming something. The song was an unfortunate choice and there was no intention to hurt anybody, he said. Sainsbury’s and Asda hope to overtake UK’s No 1 supermarket chain Tesco through the proposed merger. Britain’s regulator Competition and Markets Authority said the deal will be reviewed despite the assurance that both brands would be retained and no stores shut. The new group may be forced to shut shops where they have no rivals.