He was a Boeing test pilot at the time. He was called in for tea and biccies by management and, when asked what he thought he was doing, he replied 'I was demonstrating the airplane for the clients.!.' It wasn't a repossessed aircraft. It was either the prototype, or an early production aircraft.
Concorde was also rolled twice on 1 flight. Firstly by the Captain, then the other way by the First Officer.