Burrell says William would “explode” should his brother say anything against Princess Kate.

He explains the 42-year-old Prince of Wales “won’t take any more cheap shots from across the Atlantic”.

The former butler says William now sees his brother and sister-in-law as “background noise”.

An insider say William, who has reportedly taken on Prince Phillip’s role of “ruling the family,” makes sure royals remain disciplined.

A source told the Daily Beast that William has placed an “absolute ban on Harry returning in any way, shape or form to the family fold”.

They added:”There is a sense that William has stepped into the Prince Philip role. Philip ruled the family with a rod of iron…

“Now William is calling the shots when it comes to family discipline… He can be scary!”

Express.co.uk has reached out to representatives of Prince William for a comment.