Princess Diana reportedly suggested that the BBC announce her explosive Panorama interview on Prince Charles' birthday. In 1995, Diana had been secretly interviewed by BBC reporter Martin Bashir without the knowledge of the palace.
The interview, which saw Diana speak about her failed marriage to Charles, shocked the world and was watched by almost 23 million viewers in the UK.
During tonight's ITV documentary, The Diana Interview: Revenge Of A Princess, sources from the BBC speak about the "one remaining problem" after the interview was conducted.
Prior to the interview, Martin Bashir had said that Diana had made two stipulations right at the start of the process - that she didn't want anyone to find out about it before it had taken place
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