Prince Harry's bombshell memoir, Spare, released in paperback on October 24, "confirmed" the belief reportedly harboured by the Royal Family that the Sussex couple are "totally untrustworthy", a royal expert has claimed.

The Duke of Sussex's controversial book hits the shelves again today in its paperback edition, albeit without featuring any new material.

The release comes at the same time as King Charles and Queen Camilla's royal tour in Australia and Samoa. Publishers Penguin Random House announced earlier this year that the book's new version would be released in the UK on October 24 by the Penguin imprint Transworld.

Harry's memoir made several headlines with its claims when it was first released in January 2023 and became a global bestseller, with more than six million copies sold. In it, the duke made several revelations about his private life while growing up within the Royal Family, while he also talked about his relationship with estranged members of his family, notably King Charles and Prince William.

Now veteran royal commentator Richard Fitzwilliams said that Harry's move to release a book about his family confirmed the rumoured fears within the Firm that the Duke and Duchess of Sussex can't be trusted following their decision to step back from their senior royal roles.

Harry and Meghan made a sensational exit from the Royal Family in early 2020, when they stepped down as senior working royals and moved to the US.

Mr Fitzwilliams claimed to Express.co.uk: "Its [Spare's] portrait of the Royal Family was far from flattering.

"It has made the rift with his brother deeper and possibly irreparable. The King was so angered by his personal attacks on Queen Camilla that he evicted the Sussexes from Frogmore, their base in Britain.

"It confirmed their belief that both he and Meghan were totally untrustworthy."

The Duke and Duchess of Sussex were asked to vacate the Windsor property last year, after having been gifted it as a wedding present by the late Queen Elizabeth II.

While conceding it is not known if Prince Harry had anything to do with the release date, the royal expert added: "The publication of Spare in paperback was inevitable, but it should not have clashed with an important royal tour.

"The only thing to be thankful for is that it has no index. This will make some of the more outrageous parts difficult to find!"