“There is the possibility Harry could release another book but Spare, with those interviews, has cut them off from the Royal Family and it’s perfectly obvious why. The whole thing was proven to be a very bad idea.

“There is that in the background but when the Crown has finished, Netflix might find them more expendable. It ends in December but there are question marks as they haven’t given any real clues as to what they plan to do in the future

“They have so far not done anything of real success, bar the six-hour documentary Harry and Meghan, which many found hypocritical because they were obsessed with privacy, though they will reportedly be adapting the romantic novel Meet Me At The Lake.

“So, depending on what success they have, they could lose the contract.”

Mr Fizwilliams further warned Harry and Meghan risk being “more expendable to Netflix” as the couple have yet to dispel the argument they are a “one-trick pony”.

He continued: “When the Crown has finished, Netflix might find them more expendable. It ends in December but there are question marks as they haven’t given any real clues as to what they plan to do in the future.

“There is an argument about them being a one-trick pony – what can they actually achieve that they haven’t before? We are yet to see signs of that.

“The Crown is hugely high profile and very important to Netflix but is soon ending. To have two royals under contract gave them a cachet, and the $100million payment is pivotal to the Sussexes.”