Panorama investigates sensational allegations of historical child abuse and murder by some of the most prominent people in Britain: a paedophile ring at the heart of the Establishment. Why were the allegations described by police as "credible and true" with no hard evidence or corroboration? What role have senior politicians and the media played in promoting this story around the world? And what price will genuine victims of child abuse pay if it turns out not to be true?

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