Tapes in which the late Diana, Princess of Wales spoke candidly about her love life are no longer private and should be broadcast, the lawyer who brokered their sale has argued.
Diana's brother, Earl Spencer, has also reportedly demanded that the programme be dropped as it would hurt Prince William and Prince Harry, however Channel 4 has said that the recordings were "an important historical source".
The tapes show the late princess of Wales speaking frankly to her voice coach about her loveless marriage to the heir to the British throne and his affair with Camilla Parker Bowles, now his wife.
Burrell, who Diana once referred to as "my rock", claimed Channel 4 had gone "a step too far" and the documentary 90-minute doco Diana: In Her Own Words was likely to cause distress to her sons, William and Harry, Daily Mail reports.
Now that Channel 4 has access to the documentary, which will be in Princess Diana's voice, it will be made public in August.
And nothing was more shocking than the time in Diana's life when she was bingeing and purging during her bulimia disorder.
Twenty years after the death of Princess Diana, three documentaries reveal "controversial" details about her private life.
He said: "They were recorded privately and not meant for broadcast". What's more, I said 'What do I do?
However, the broadcaster has been criticised for the documentary, which uses taped recordings from private voice coaching sessions Diana was given in 1992 - 1993.
The tapes - recorded by Diana's speech coach Peter Settelen - have been screened in the United States but never broadcast on British television, with some of the footage due to be shown for the first time.
A senior source said: "Neither the Duke of Cambridge or Prince Harry will be making any comment whatsoever expressing their views about the Channel 4 documentary". The show is called Diana: In Her Own Words.
It also features compelling interviews with Diana's close friend Dr. James Colthurst, her friend and dance teacher Anne Allan.
"Everybody knew about the bulimia in the family and they all blamed the failure of the marriage on the bulimia, and that's taken some time to get them to think differently". Penny Juror a royal biographer has expressed the opinion that airing the tapes is a very bad idea and another way of exploiting Diana.
Excerpts of the recordings were aired in the United States in 2004 but they have never been screened in Britain.
Diana attends a royal appointment with her then-husband and two sons.
She also discussed her courting with Charles, and how she was "unimpressed" with him as a youth.
She told the Guardian: "This doesn't belong in the public domain. In another case, with a young 16-year-old girl who was missing a limb, she'd touch her necklace, just little gestures showing that Diana was paying attention".