Panorama Special in which Robert Peston investigates the questions behind the phone hacking trial which saw David Cameron's former spokesman, Andy Coulson, convicted.

In a Panorama Special, Robert Peston investigates the questions behind the phone hacking trial which saw David Cameron's former spokesman, Andy Coulson, convicted and three other News of the World News editors plead guilty.

Did politicians of all parties and police help to cover-up the hacking scandal for years because of their own close relationships with Rupert Murdoch's News International?