[source: NY Daily News]

On August 31st, it will be the 20th anniversary of Princess Diana’s death.

And while the world is already flooded with stories, headlines and documentaries about her life, the show will feature footage previously unheard in the UK, and will feature some uncomfortable revelations about the royals.

The Channel 4 documentary is set to air next Sunday, and is entitled Diana: In Her Own Words.

The 90-minute programme features footage that has been, until now, unheard in the UK, with Diana speaking very candidly about the trials and tribulations of her life after meeting Charles.

The footage was shot by Diana’s speech coach, Peter Settelen, between 1992 and 1993.

He has chosen not to appear in the documentary that is causing controversy even before it has aired.

Explaining why Settelen has passed on the tapes, his solicitor said: “For the past 15 years Peter has been reluctant to show the tapes.

“But now, coming up to the 20th anniversary, with everyone, including her own children, discussing Diana and revisiting her life, he wants Diana to be able to speak for herself. It’s about giving her a voice.”

The Mail is reporting that Diana’s brother, Earl Charles Spencer, contacted Channel 4 to ask them not to air the film, for fear of the distress it could cause her sons.

It has been publicly condemned by Diana’s close friend Rosa Mockton, who has said: “I think it’s completely inappropriate that they are being shown publicly.

“The tapes should have been sent to the boys. They should definitely have been sent to her sons.

“I just think it’s absolutely disgusting.”

Royal biographer Penny Junor has also slammed it.

She said: “This is just another way of exploiting Diana.

“It’s not what Charles would want and it’s clearly not what the boys would want. It will be deeply hurtful to them.

“It seems to me a very bad idea to broadcast these tapes, especially at this difficult time for the family.”

At the time of publishing, Channel 4 has not backed down on its plans to broadcast the documentary.

A spokesperson said: “The excerpts from the tapes…are an important historical source.

“We carefully considered all the material used in the documentary and, though the recordings were made in private, the subjects covered are a matter of public record and provide a unique insight into the preparations Diana undertook to gain a public voice and tell her own personal story, which culminated in her later interview for Panorama.”