I am also in agreement with Mirabel. The relationship that Charles and Camilla have today took years to develop and grow.
Camilla, today, is even on very good terms with Andrew Parker-Bowles and I imagine, that if Diana had lived, Charles and her would have come to an amicable, working arrangement as it seemed they were heading that way when she died.
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I think that is optimistic about Charles and Di. Maybe in time they would have gotten to some kind of relationship but I'm not sure it would have happened too soon. but I agree about Chas and Camilla. I think that they have grown gradually into a deeper friendship and love as the years went by. He loved her when she was young but it was probably an immature love and she then loved Andrew. I think that Charles was too young then to marry and knew it, but he did have a deep feeling for Camilla, I think she was always special and when she married Andrew, he couldn't let go of her completely. And she remained fond of him but settled with the man she loved and believed would be the right husband for her. But I think over time she did grow disillusioned with the womanising and neglect.. and within a few years she turned to Charles as a lover because he was giving her the atteniton she wanted, form her man. and they grew into a more passionate love but Chas knew that he had to get married and tried to cool the Camilla friendship down to just friendship.
I think that Camilla now has a good friendship with her ex, he and she had a friendship as well as a marriage, and when they both settled down iwht other people, they were able to resume that good friendship and see their grandchildren etc with pleasure and be friendly with each other.
but while I would like to read
A book about Camilla, I think the timing isn't that great. It is her 70th birthday true but it could look like having a go at Diana's memory, and justifying her own faults at the time of the marriage.. at the time of Di's 56th birthday... and the 20th Anniversary of her death.
Camilla, by and large has been of the "don't complain, don't explain" school, and I tihnk that has served her well. Charles did some PR for her, true but overall Camilla didn't talk to the press or complain about the past and just married Charles and got into her royal job, and in doing that, quietly, she won approval from the public, bit by bit..
If she authorised or smiled on a book at this time, it could be glossed as re fighting the war of the Waleses when it has now been over..