This week, it was revealed that William has been in touch with the BBC after the British broadcaster launched an independent probe into Bashir’s famed 1995 interview, where Bashir allegedly duped the princess into sitting down with him.

Reports have suggested that Harry’s taking a back seat — but we’re told that while William and Harry are not in constant communication, they remain united on their bid to get to the truth about the explosive interview.

A source close to Harry — now living in Montecito, CA, with wife Meghan Markle and baby son Archie — told us: “Harry is getting regular updates and is aware of everything that is happening.”

They added that while William has made a public statement about the claims, “You do not need a public statement [from Harry] to imagine how he is feeling privately. People know how much his mother means to him.”

“Sadly, some people are not just seeing this as a drive for truth, but also trying to use this as an opportunity to try to drive a wedge between the brothers,” said the source.

Diana’s furious best friend Rosa Monckton told ITV this week: “For [William] and for Kensington Palace to issue a statement I think shows how deeply involved he has become in this story and about how his mother was treated … I know people are saying she would have done an interview anyway, but she hadn’t and she didn’t … she always said no.

“There is no doubt in my mind at all [that] Mr. Bashir had persuaded her that she was doing a good thing, that everybody was conspiring against her … And she took it all in. She was vulnerable. It was a disgusting and disgraceful thing to do.”

The BBC has now appointed an ex-judge, Lord Dyson, to lead an inquiry into how Bashir obtained the 1995 “Panorama” chat, in which she famously said of Prince Charles and Camilla Parker-Bowles: “There were three of us in this marriage, so it was a bit crowded.”

Their uncle Charles Spencer, 9th Earl Spencer, has been spearheading the bid to investigate Bashir’s alleged behavior.

He claimed that fake documents, including fake bank records, were used by program-makers to trick his sister into doing the interview, preying on her fears that she was being spied on and could not trust those around her.

However, Spencer tweeted on Friday: “As I’ve told the BBC this evening, I’m not at all satisfied with the parameters they’ve set around their [inquiry] into the ‘Panorama’ interview with Diana of 25 years ago. Lord Dyson must be free to examine every aspect of this matter, from 1995 to today, as he sees fit.”

Bashir has made no public comment.