Princess Diana's loved ones are said to be deeply upset after it was revealed her letters to James Hewitt will be read out in a new Channel 4 documentary. Intimate details of her relationship with the former army major are described in the correspondence, which Diana once begged him to destroy.
Before now, it has been impossible to publish the contents of the letters as the copyright is owned by Diana's estate. Channel 4's lawyers believe, however, that extracts can be used if they are in the public interest.
"The law permits 'reasonable extracts' to be published where they forward legitimate debate on the subject," said a source at the company. "The question is what constitutes a reasonable extract. We know that if we push it too far we will risk an injunction."
The documentary follows James Hewitt over a six-month period, including his recent trip to America in which he tried – and failed – to sell the letters for £10 million. In the course of the show he scoffs at rumours that he is Prince Harry's biological father and boasts of his many lovers.
Confessions Of A Cad is due to be broadcast on July 24.