Former US President George W Bush has said that British lives were saved using information obtained from terror suspects by "waterboarding", an interrogation technique which simulates drowning.

In 2008, Vanity Fair magazine invited the journalist Christopher Hitchens to experience the controversial technique at the hands of men who once trained American soldiers to resist - not inflict - it.

He then spoke to Newsnight's Jeremy Paxman about the experience.

First broadcast on Tuesday 8 July 2008.