Royal commentator Richard Fitzwilliams said that Prince William will approach the title of Prince of Wales differently from his father Prince Charles.
During an interview with Express.co.uk, Mr Fitzwilliams said that William will highlight key areas that he cares about while in the role, but added it is unlikely he will become an activist for some causes, like his father.
Mr Fitzwilliams said: “When Prince Charles ascends to the throne Prince William becomes the Prince of Wales.
“That makes him one step closer to being a monarch.
“It is all a gradual process and it is so unpredictable as Prince Charles is the longest Princes of Wales in our history.
“There is also a question that Charles is an activist Prince of Wales.
“I suspect very strongly that William will champion certain causes.
“But the indication is that he might share his father’s enthusiasm for certain issues, like for the ivory trade for example.
“Prince William is unlikely to have the activist element that Charles has shown for so long.”
Mr Fitzwilliams also noted a problem Prince Charles will encounter when he becomes king that his son is unlikely to have to deal with.
Mr Fitzwilliams admitted there was a long-standing rumour that, under Prince Charles, the monarchy would become more slimline.
He added this comes with a heartbreaking issue as one of the Royal Family’s key purposes will be threatened.
He said with less working royals, there would be less royals partnering with charities and becoming patronages.
This could result in many charities no longer benefiting from having a member of the Royal Family supporting them and bringing with them a multitude of benefits.
He said: “The royals have some three thousand patronages and institutions that they are attached to.
“They carry out something like three and a half thousand engagements every year.
“It is very valuable for an institution or charity to have a member of the Royal Family to have a patron.
“This is because it draws in funds or helps with that, it could mean that the charity can use the palace as a venue, it also means that if they attend an event you can charge more.”