The Duchess of Sussex and husband Harry are settled in the US and unlikely to leave, Andrew Morton, author of a 1992 book on Diana, believes.

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Asked about a possible return, he told Sky News: “What, and have Meghan curtsying to Kate? I don’t think so.

“I don’t see that as a runner. They’ve got their own lives in California.”

Royal Highnesses bow and curtsy only to majesties, so Meghan would only have to do so to Kate once the Princess of Wales becomes Queen.

Mr Morton also claimed Diana wanted her ex-husband Charles to move to Italy with Camilla to farm and sketch, leaving William as King.

The writer said Di wanted Harry to be a “wingman” to William in his “difficult, lonely” job of heir, adding: “Well, that hasn’t happened either.”

Unheard Diana audio is due to air in The Rest Of Her Story on US TV.

Extracts feature Di, who died in a car crash in 1997, talking about how Charles expressed disappointment that Harry was not a girl at his christening.