Princess Diana told an interviewer her ex-husband Charles should stand aside to let their son William succeed the throne.
The revelations come in a bombshell new documentary, Diana: The Truth Behind The Interview, which marks 25 years since her infamous appearance on Panorama.
During her chat with Martin Bashir on the BBC show, Diana lifted the lid on her marriage, her relationship with the royals and Charles’ connection with Camilla Parker-Bowles.
However, the new documentary reveals she dropped some more bombshells during a chat with former Daily Telegraph editor Max Hastings weeks before sitting for the Panorama interview.
In The Truth Behind the Interview, Hastings reveals he decided not to publish Diana’s words as he was worried they were too incendiary.
He explained: “I spent the best part of a couple of hours with Diana and she put on a wonderful show. It was absolutely gripping stuff.
“It became clear first of all how much she hated Charles… yes, she did hate Charles. When I said ‘were there ever happy times?’, she said ‘no, the marriage was hell from day one’. “I was amazed by the frankness and the directness with which she said that.”
He went on to claim she told him her son William was her priority and she wanted to see him take over as King ahead of his father Charles.
That incredible momentfrom the infamous Princess Diana interview
Hastings went on: “She said that all she cared about was William’s succession to the throne and she said to me, quite explicitly, ‘I don’t think Charles can do it’.
“The outcome she wanted to see was for Charles to stand aside as heir… and for William to occupy the throne. This was pretty dynamic stuff.”
He added of his decision not to publish Diana’s words: “I felt that my job was to try and help them keep a lid on the worst of this, rather than to lift it off.
“Diana said a lot of stuff on several occasions which I thought [was] for the fairies.”
He added that he did “feel so desperately sorry for her”.
The documentary lifts the lid on the Panorama interview as well as Charles’ own sit down chat with Jonathan Dimbleby in 1994.
Reports suggests Charles’ TV chat was the catalsyst for Diana wanting to tell her own side a year later in the Panorama chat with Bashir, which aired on 20 November 1995.
Diana died in a car crash in Paris two years after the Panorama interview was broadcast.