Mr Royston suggests Harry and Meghan do the preliminary work before going into these visits, advising them “to check and recheck and double check.”

He also suggests researching all of the dignitaries they plan to meet.

“I think they’re just going to have to chalk it up to experience and keep going down the same path and working with, you know, host nations where they have the offers from governments to do it.

“I mean, it is dependent on them being given a formal invitation and a government being willing to roll out the red carpet for them.”

The Royal Family cannot stop Harry and Meghan from carrying out these visits, but they can step in, and speak to the host nation and ask them to refrain from extending the invitation, it’s being said.