Jimmy Savile was free to abuse hundreds of young people across the UK over six decades. It happened in BBC dressing rooms, hospital wards, children's homes and schools, yet no-one stopped him. As the BBC and Department of Health each prepare to publish their own inquiries into the scandal, Panorama's Shelley Jofre investigates why Savile was given free access to the most vulnerable patients at Broadmoor Hospital and asks how the DJ got so close to the heart of Britain's establishment.