Princess Diana is said to be devastated if Prince Harry disapproved of the charity

Princess Diana would be furious about Prince Harry for abandoning his brother William to continue her charity work alone, an expert claims.

RadarOnline.com can reveal William, 42, will appear in a new documentary highlighting the homelessness issue in Britain, an issue close to his late mother’s heart.

In the run-up to the screening William named Harry40, named for the first time in years and tells stories about when Diana took them both as young boys to a homeless shelter in London.

The reference to Harry was seen as an ‘olive branch’ between the two warring brothers, but according to royal expert and journalist Phil Dampier, their rift shows no signs of healing – leaving Diana, who died in a car accident in 1997 at the age of 36destroyed.

He told it The sun: “Princess Diana took both her sons, William and Harry, from a very young age to see how the other half lives.

‘She was determined to show them that not everyone lived in palaces, and that not everyone was born with a silver spoon in their mouth.

‘Diana let them sleep rough when they were younger, to show them what it was really like.

“Some see it as an olive branch to Harry, mentioning him for the first time in six years in this documentary.

“I don’t see that myself. I think the gap between them is unfortunately still as wide as ever.

“It’s just a pretty sad indication of the fact that they’re no longer doing something that they could have worked on together, and something that they both experienced at a young age.

“It’s left William alone, and Harry isn’t participating in it, so I don’t see this as an olive branch.”

About why the prince spoke about his brother, who disapproved of the Royals in his memoirs Savethe expert believed that he ‘couldn’t just take him out of history’.