“He’d used the secret code, the universal password. Ever since we were boys those three words were to be used only in times of extreme crisis.”

Harry explained that William repeated the three phrases again, adding: “Willy wasn’t quite ready to accept defeat. ‘I’ve felt properly sick and ill after everything that’s happened and, and I swear to you now on Mummy’s life that I just want you to be happy’.

“My voice broke as I told him softly: ‘I really don’t think you do’.”

The duo reportedly met recently for the funeral of Diana’s brother-in-law, Lord Fellowes.

Spare’s publisher, Penguin, recently announced that a paperback version will be released in the coming months.

Following the announcement, some have asked if Harry would provide any additional information or updated anecdotes.

After all, much has changed since the book was published.

When a book is reissued in paperback, it frequently includes updated information or additional chapters.

However, it has since been confirmed that the paperback version of Spare will contain no new information, leaving the book’s contents untouched.

It’s unclear whether Harry made a fresh decision or whether this was always the plan.