Patrick Jephson, Diana’s private secretary, for eight years, spoke publicly in 2017 about an ongoing campaign to boost the then Duchess of Cornwall’s reputation in the public eye ever since her affair with Prince Charles became public knowledge.
“It’s not the palace…but advisors to Prince Charles, who over many years have crafted a systematic, sustained and expensive campaign to rehabilitate Camilla’s reputation and make her suitable to be the next Queen,” he said.
Jephson want on to say,
“This is linked, of course, to a pretty vile campaign to publicise a bogus psychiatric diagnosis that Princess Diana had a personality disorder.”
“This may have cost the Prince a lot of money, paying for PR spin doctors”
“I think it also raises ethical question marks over the methods they (Prince Charles’ PR representatives) have used.”
There is an interview with him and Camilla Tominey I think on You Tube talking about this and he gives a very credible account of his days working with Diana and how he became aware of briefings against her.
I don’t know how CS has corrected this until I have received my copy but he said in one of his interviews broadcast last night that that was one of his motivations for writing Swan Song.