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Royal insider set to drop explosive Diana exposé

Prince Charles is “furious” that a long-time Buckingham Palace press officer is ​set to expose marital secrets ​between the heir to the throne and his tragic ex-wife, Princess Diana, ​in a revelatory new book, ​according to a published report.

The loose-lipped confidant ​is the queen’s ex-press secretary, 73-year-old Dickie Arbiter, who knows intimate details about Charles’ marriage to Diana and the disintegration of two other royal pairings.

“Charles is furious,” a palace source told the ​Sunday ​Mirror. “This man was a trusted friend.”

Arbiter’s book, “On Duty with the Queen,” will reportedly offer a “behind the scenes” look at life in the palace during “the most turbulent [period] in the history of the modern British monarchy.”

During Arbiter’s ​12 years of employment, Charles and Diana had a viciously public split, and the princess died in a tragic car crash ​fleeing from paparazzi ​in Paris.

“It is just a case of a man who he thought was a friend and who could be trusted cashing in on the misery of that time. It is disloyal,” the palace source said.

​Arbiter ​was with Charles during ​the bitter breakup of his marriage to Diana​, his affair with Camilla Parker Bowles ​ and when Diana was killed​.

Prince Charles arrives with Camilla Parker Bowles at a charity function in 2000.AP

The book is due to be published in October and will “delve into the dark days” of Diana’s “isolation” when her husband’s affair was first discovered, a source told the Mirror.

Arbiter is billing the book as more of an autobiography than a tell-all.

“This is not just a memoir of an intense dozen years but is a story of a life, my life and it’s been quite an ­extraordinary one,” he said.

But the former press secretary also promises to offer a “candid look behind the scenes of the most sensational and ­salacious royal stories.”

Arbiter, who worked in broadcasting before joining the palace staff in 1988, has criticized others for writing books on the royal family before.

“Everyone who writes a book is just cashing in,” he said following the publication of Tina Brown’s “The Diana Chronicles.” “Frankly there is nothing more to write on Diana.”