Prince William is relying on the close support of new allies as Kate continues her cancer treatment and Prince Harry remains in the US, an expert has said.

This, combined with the Prince of Wales' increasingly strained relationship with his brother Prince Harry, has seen the future King gain new confidants.

Royal expert Jennie Bond says William has grown closer to Peter Phillips (Princess Anne's 46-year-old son) and cousin-in-law Mike Tindall.

Ms Bond added that “[Harry] is not, and will not, be here to help or provide a shoulder to cry on.

“I’m really glad that William has a cousin who is almost like a brother to him in Peter Phillips,” Bond continued. “Peter is incredibly down-to-earth, solid, and has been there for both William and Harry in good and bad times.”

She continued: “People he can trust absolutely and who are showing that they are there for him when the going gets tough.

"I think it gave us a glimpse of the future for when William becomes king. He may not have his brother at his side, but he will have a band of loyal and close relatives to help him represent the monarchy.

"I’m sure that, whenever they can, they will step up to help William when the burden of kingship finally falls on his shoulders.”