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Princess Diana’s brother Earl Spencer refused to speak about his book during an appearance on Good Morning Britain on Tuesday.

Charles, 57, headed into the ITV studio to talk to Richard Madeley and Susanna Reid about the BBC's recent statement regarding the rehiring of Martin Bashir as religious affairs correspondent in 2016.

Referring to Bashir as a "serial liar", Charles claimed that the BBC were well aware of what he was like and what he had done in order to obtain an interview with his sister Princess Diana back in 1995.

Bashir's now infamous 1995 chat with the People's Princess has come under fire recently.

A huge investigation into it by Lord Dyson, the former master of the rolls and head of civil justice, found that Bashir used deceitful measures to secure the Panorama chat with Diana.

Princess Diana’s brother Earl Spencer refused to speak about his book during an appearance on Good Morning Britain on Tuesday
(Image: Ken McKay/ITV/REX/Shutterstock)

A report into the interview concluded that Bashir acted inappropriately and in serious breach of BBC guidelines.

It read: "I have also concluded that, without justification, the BBC covered up in its press logs such facts as it had been able to establish about how Mr Bashir secured the interview and failed to mention the issue at all on any news programme and thereby fell short of the high standards of integrity and transparency which are its hallmark."

When asked what he thinks former Director General of BBC Tony Hall should be asked by MPs on Tuesday, Charles said: "I think the first one is, 'are you telling me that you didn’t know that Martin Bashir was going to be offered this job when you knew, more than anyone, that he was a serial liar? Because you investigated him and found him to be a serial liar. So how is it possible that you didn’t know, if you’re claiming that?'"

Susanna Reid asked Charles what he thinks MPs should ask former Director General of the BBC Tony Hall
(Image: Ken McKay/ITV/REX/Shutterstock)

"It’s quite interesting with James Harding, who I don’t know at all, when he was asked a few weeks ago when they first mooted this inquiry within an inquiry about why Bashir got this job, he was asked, ‘did you have conversations with Tony Hall?’ and his answers are not straightforward.

“So I think that the MP’s today should get a straight answer as to how much Tony Hall knew and who was in charge of this process.

Martin Bashir's now infamous 1995 chat with the People's Princess has come under fire recently
(Image: PA)

“The most fascinating part of this to me is that Bashir didn’t apply for this job, he was asked to apply for it and the other candidates were… well one of them said he or she knew that they weren’t going to get it and that Bashir was a shoe in, but why?

Asked if he believes Bashir got the job in order to “shut him up”, Charles was reluctant to answer because of lawyers but simply said: “It’s definitely a possibility isn’t it?”

Richard then attempted to steer the conversation towards Charles' book The White Ship: Conquest, Anarchy and the Wrecking of Henry I's Dream.

Richard Madeley described Charles as 'honourable' when he refused to 'plug' his book on the show
(Image: ITV)

However, Charles understandably wasn't so keen on discussing his book after the Martin Bashir conversation.

"You're very sweet and I was originally coming here to talk about the book, but I actually think given the seriousness of what we've been talking about, I'd either like to continue talking about that or skip the book because I don't want to do a plug for my book on the back of something so important," he said.

"Well, that's very honourable of you," Richard replied. "Would you come back to talk about this book?"

"Delighted to! I just think it would be very odd to stick this on the back of it…" Charles added.

Good Morning Britain airs weekdays at 6am on ITV.