“What I see now is an angry, petulant, privileged prince who is constantly blaming other people and not taking accountability on his part.”

Mr Burrell, 64, served as a footman for the late Queen before working for Diana for a decade until her death in 1997.

Speaking from his home in Florida, he said the Duke of Sussex had “changed fundamentally” and that his mother would be “appalled”.

“She would be angry at these personal, vindictive revelations which don’t just undermine Harry, but his country, his family, the institution – which his mother was very proud of – and his late grandmother’s legacy,” he said.

Mr Burell said Meghan Markle had a “huge influence” in the writing of the book.

He added that in his opinion: “This isn’t just a book written by Harry… Meghan’s had a huge influence in this book. She’s beside him steering him on his path. You can’t just blame Harry. You have to blame the both of them.

“I don’t like to see the rug being pulled beneath the feet of our King and Harry’s brother, who is on his way to being King. And the snipes that have gone forward about Kate [the Princess of Wales]…”

When Mr Burrell published his book in 2003, he was accused by Harry and William of “a cold and overt betrayal”.

In his memoir Spare, Harry describes how he learned of the book when he was working as an unpaid farmhand in Australia aged 19 in 2001 after leaving Eton.

He writes that he received a package from Buckingham Palace, which was full of memos from the Palace communications team about “a delicate matter”.

“It was merely one man’s self-justifying, self-centring version of events. My mother once called this butler a dear friend, trusted him implicitly. We did too. Now this.

“He was milking her disappearance for money. It made my blood boil.”