Former butler to the King, Grant Harrold has said the monarch "cutting off" Prince Andrew has been a "long time coming".
Charles has reportedly cut off Andrew's £1million yearly allowance and security funding in a brutal move after the Duke of York refused to downsize his property.
According to royal biographer Robert Hardman, King Charles directed the Keeper of the Privy Purse to end Andrew's personal allowance.
This decision extends to Andrew's private security detail, which will not be renewed beyond October.
King Charles has reportedly cut his brother off
PA
Speaking to GB News Harrold said: "It is obviously a bit harsh, but it is a long time coming because technically he's no longer a doing any duties in behalf of the king.
"One of the reasons for the allowance is as a salary, if you like.
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"As he is no longer actually doing royal duties, it doesn't really make sense for him to be given this wage.
"I mean, we've got to remember he's not going to be kind of poor from this because obviously inherited mother money from his late mother, Queen Elizabeth the Second.
"So he's probably in quite a good situation. He's still got Frogmore Cottage, which is also been quite a big discussion recently because there's been obviously it's been said that the King wants him out of that cottage and obviously he wants to remain there.
"It was a home that he'd been in for many years. Queen Elizabeth was happy for him to be there, and for whatever reasons, the King wants him to downsize and changed things around.
"He wants to stay there. So maybe this is the way forward is the cut of the allowance, but you can keep Frogmore."
He added: "It's interesting because when I was there, the family were always close.
"There wasn't these kind of battles now that seem to have grown within the Royal Family. It was nothing like that when I was there, and it's quite strange to see how times have changed."
Andrew has refused to move out of Royal Lodge
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A Palace insider told The Sun: "It isn't a secret that the King wants him out."
The financial cut may force Andrew to relocate from his 30-room Royal Lodge in Windsor.
Sources suggest he might need to downsize, possibly to Frogmore Cottage that was previously owned by Meghan Markle and Prince Harry.
