Prince Charles, 72, is first in line to the throne when the Queen dies but has been facing calls to let Prince William take over as head of state. The Prince of Wales is the oldest heir apparent in British history. Royal expert Jonathan Sacerdoti has said there is "no strong argument" for Charles to let the crown to go to William.

       Speaking to Express.co.uk, Mr Sacerdoti said: "I don't think there's a strong argument for it and I think that Prince Charles will be a different kind of monarch to his mother and William will be a different kind of monarch to his father and grandmother.

       "I think there is no chance that Prince Charles will be King for as long as his mother.

       "It's just statistically and mathematically impossible.

       "It will be a very different reign in just that respect.

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       "But I don't see why he should pass the crown downwards and I don't think that would be desirable from anyone's point of view. He'll bring to the role his own agenda.

       "It's not going to be a surprise when Charles is King that's how they've been planning it for years.

       "I'm sure they must have conversations amongst themselves about the wider agenda of the Royal Family and the short term aims of it.

       "They might have already had conversations about where each of them will take the monarchy in."

       It comes as royal expert Stewart Pearce has explained how Charles could step aside and let the Duke of Cambridge take his place.

       Speaking to Royally Us on Us Weekly, Mr Pearce said: "We know the position he is about to inherit, it's going to be very interesting to see if Prince Charles will sit in the throne or will he create some form of a shift in constitutional law to allow his son to sit in the throne.

       "That's going to be very interesting.

       "At the moment the right of ascendency is Charles on the throne but I don't necessarily see Queen Camilla."

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       He added: "Constitutional law could be revoked and changed because after all we're living in extraordinary times."

       Charles has been stepping into the Queen's shoes since her 95th birthday.

       Speaking to Palace Confidential on MailPlus, royal commentator Richard Eden said: "Palace officials have been very keen to play down the idea of a summit Charles has called with Prince William to plot the future.

       "But they will be having lots of conversations. When the Queen is 95, by definition it will be a transition of some effect.

       "Charles will be with her at all those big events such as the state opening of Parliament."