Prince Harry, 36, and Meghan Markle, 39, stepped down from royal duties to become financially independent from the Royal Family. The Sussexes have since gone on a whirlwind on interviews to discuss their lives as royals but Vanity Fair Royal Correspondent Katie Nicholl has revealed the "threat" that faces the Duke and Duchess in the future. She told True Royalty TV’s programme The Royal Beat that the history books will favour the Royal Family.

       She said: "I think the biggest threat to Harry and Meghan, once these book deals are done and the podcasts are done and Spotify, then what is their currency?

       "This book will make the Royal Family very nervous as will many events of the future.

       "But it will come good for them, because the Royal Family will always be the Royal Family.

       "So I suppose there is a level of comfort in that, when you see how history has played out until now."

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       In the Channel 5 documentary Meghan at 50: The Climb to Power, royal expert Tom Quinn explained The Duchess of Sussex is using her knowledge to make her and Harry into a "profitable brand".

       Narrator Paula Bacon said: "The obvious location to settle was California, the place Meghan knows best.

       "Free from the shackles of duty. Here she could use all her contacts and media know-how to turn the Sussexes from exiled royals into a successful and profitable brand.

       "America welcomed the Sussexes with open arms."

       Mr Quinn added: "There's this very determined, forceful woman who wants to make as big a splash and probably make as much money as possible as soon as she can.

       "It's probably easier to do that in California with her connections than to do that in Canada.

       "Also, I think press reaction in America to this was that Meghan's come home, she's been badly treated by the British Royal Family.

       "It's much more positive coverage but not universally, some sections of American society thought she couldn't hack it and that's why she's gone back."

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       The Sussexes have been told they need to "earn a load of money" to pay for their Montecito mansion in California.

       Royal biographer Angela Levin told talkRADIO: "Any chance you've got of meeting Harry and Meghan now is if you buy a table for ten grand at some function they're hosting which is rather unfortunate."

       Ms Levin added: "They have to earn a load of money to pay for their mortgage and getting the huge house cleaned and the garden done.

       "It's got 16 bathrooms, it needs quite a lot of scrubbing over time."