The internet is a global lavatory wall, a Rabelaisian mixture of truth, lies, insanity and humour. I felt its power and madness this week, when an excerpt from my new film, Unlawful Killing, was leaked on to YouTube and seized on by US conspiracy theorists, who immediately began claiming that the CIA had murdered Princess Diana, thereby allowing others to dismiss my documentary as mad.
Deriding its critics as mad is an age-old British establishment trick. My "inquest of the inquest" film contains footage of Diana recalling how the royals wanted her consigned to a mental institution, and the inquest coroner repeatedly questioning the sanity of anyone who wondered if the crash was more than an accident. His chief target was Mohamed Al Fayed, a man I once profiled for a Channel 4 documentary. Before I met him, I'd half-believed the media caricature of him as a madman, driven nuts by the death of his son, and wildly accusing the Windsors of having planned the 1997 crash. However, I found a man who was sane and funny but frustrated that Britain wouldn't hold an inquest into his son's death. Michael Mansfield QC thought it unfair too, and fought for one to be held; which was why the longest inquest in British legal history eventually began in 2007.