Fair play to Prince Harry for dropping everything and flying over to see his poor old dad, King Charles, who has revealed a shock cancer diagnosis. The King was clearly enthusiastic about the visit, delaying his helicopter flight to Sandringham. Helicopter, eh, so much for net zero. But the meeting between Charles and Harry reportedly lasted little more than half an hour. That’s about as long as an episode of Coronation Street, and this right royal soap opera shows no signs of a happy ending, even if this Rover has returned. Now, if your old man had received this worrying health news, would yo…