My aunt was personal secretary to barbara cartland for 17 years, around the time that Charles and Diana got engaged.
I was told some inside goss which i am happy to share with those of you who maybe interested.
Charles was never in love with Diana. He was instructed to marry her by the Queen as she was the only ” suitable” woman he had not dated (probably cos he was too busy screwing carmella!) and the Queen wanted heirs to the throne…lets face it…hes not up to the job.
So after years of Diana humiliating the royals, which she did with such panache and style, they decided to bump her off….they didnt fancy arab blood in the royal family, despite the fact they are all german and greek.