Back in the days before they could just text people, British royals carried on their love affairs discreetly, via post. Prince Charles wrote a series of letters to a Canadian woman with whom he was involved years ago, before Diana and Camilla. Why do we know this? The recipient of the letters sold them, thinking they'd end up in a museum. Except not so much with the museum -- more like eBay, where any nosey individual can bid on them.