Prince William is set to appear on screen on Wednesday and Thursday this week in a documentary about homelessness, a subject about which his late mother was passionate

Princess Diana would be angry with Harry for leaving Prince William to carry on her legacy alone, a royal expert claims.

Phil Dampier also believes the two warring brothers will never reconcile – despite William mentioning Harry by name for the first time in six years in a new documentary set to air tonight.

The Prince of Wales, 42, features in the ITV programme, called Prince William: We Can End Homelessness, which concludes on Thursday. In it, he hears stories from those in need as he tackles homelessness, something about which Diana was also passionate.

But Mr Dampier believes Diana would be furious Prince Harry has not followed the legacy with his brother. The journalist and author said: “She was determined to show them that not everybody lived in palaces, and not everybody was born with a silver spoon in their mouth. Diana let them sleep rough overnight when they were younger, to show them what it was actually like.

“It’s been seen by some as an olive branch to Harry because he’s mentioned him for the first time in six years in this documentary. I don’t see it that myself. I think the rift between them is still as wide as ever, unfortunately.

“They both could have done so much good for something which she was very anxious for them to to do and so I’m sure she’d be absolutely devastated.”

Homelessness was close to Diana’s heart, and she once took both her sons as young boys to a homeless shelter in London. William said he wanted to focus on the subject in the documentary because he said he has faced criticism about his privileged lifestyle and many residences.

It’s thought the Prince has not mentioned his brother’s name in public or in an interview since 2018, when the two, alongside the Princess of Wales and Meghan Markle, were interviewed at the Royal Foundation Forum, The Sun reports.

But though he name drops Harry in the programme, Mr Dampier believes royal fans shouldn’t get too excited by this. He added: “It’s just a rather sad indication of the fact that something which they could have worked together on, and something which they both experienced at a young age, they’re no longer doing. It’s just left William on his own, and Harry’s not joining in, so I don’t see this as an olive branch.”