Prince Harry and Meghan Markle have been slammed as “unpredictable” by a royal expert who claimed they are set to make one big move that could upstage the Royal Family.

Royal commentator Richard Fitzwilliams said the couple are set for another “faux royal tour” following their successful visit to Nigeria in May.

They’re due to travel to Colombia later this year, which Mr Fitzwilliams said could prove troublesome for the Firm as they are unable to plan an event that will “attract attention on the same level”.

He told The Sun: “I think when you have former senior working members of the Royal Family do what the Royal Family would like to do, I do think will create difficulties. Because the problem is that the Sussexes are so unpredictable.

“The problem with Royal Family at the moment is that they are simply not able to do something which attracts attention on the same level – and attention is important if you’re royal.”

He said this was due to both King Charles and Princess Kate fighting cancer and being predominantly out of the spotlight, unable to conduct their royal duties as normal and leaving a “vacuum” that less senior royals were unable to fill.

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