As an object lesson in how to feed conspiracy theorists while trying to see them off, the Princess of Wales’s Mothers’ Day photograph of herself and her three children could hardly be bettered. For weeks since the sudden announcement that she was to undergo abdominal surgery in January, the internet has been buzzing with speculation as to the nature of her undisclosed condition, along with hints that it could all be a lot more serious than the official royal news sources were making out. The