Prince Harry is “permanently in a state of paranoia over The Firm betraying him”, a royal expert has claimed.

The Duke of Sussex launched a blistering attack on his estranged family in his explosive memoir Spare, which was released in January last year, and alleged his father’s second wife Camilla Parker Bowles leaked and planted information about him to the press in order to improve her standing in the Royal Family.

Harry claimed Charles and Camilla, along with their “spin doctor”, leaked stories about the prince’s visit to a drug rehab centre in 2002 and threw Harry “right under the bus”.

“I had complex feelings about gaining a step-parent who, I believed, had recently sacrificed me on her personal PR altar,” Harry wrote. “In a funny way I even wanted Camilla to be happy. Maybe she’d be less dangerous if she was happy?”

His allegations against his estranged family have reportedly led to the father-of-two being on edge over his relationship with the Royal Family, and according to royal author Tom Quinn, Harry is “paranoid” the monarchy will launch a counter-attack.

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“Because Harry is so far away now from the day-to-day lives of the rest of the Royal family, he’s permanently in the state of paranoia about ‘The Firm’ betraying him or doing things without letting him know or planning things that will make him look bad,” Tom told The Mirror. Harry continued with his barrage of allegations against his family in interviews to promote his memoir, he accused the Royal Family of having a relationship with the British press that involved “briefings, leakings, and plantings”.

In an interview with ITV’s Tom Bradby, the prince accused his estranged family of getting “into bed with the devil”, and claimed Camilla allegedly leaked one of her conversations with William to the press. Harry alleged his brother was “seething” over rumours Charles, Camilla and her spin doctor were leaking stories about his private life, and wrote: “Pa and Camilla’s people had planted a story or stories about him, and Kate, and the kids, and he wasn’t going to take it any more. Give Pa and Camilla an inch, he said, they take a mile.”

‌He even referenced his late mother’s infamous interview with Martin Bashir, in which she alleged there were “three people” in her marriage to Charles. “I have a huge amount of compassion for her, you know. Being the third person within my parents’ marriage and she had a reputation, or an image, to rehabilitate. Whatever conversations happened, whatever deals or trading was made right at the beginning, she was led to believe that that would be the best way of doing it,” Harry wrote.