The former US president George W Bush has defended the use of "waterboarding" on terrorist suspects, saying it saved London from attacks.
Speaking in the programme, Dr Kim Howells, a former chairman of the Intelligence and Security Committee that oversees the work of the intelligence community, condemned the practice as "torture".
A David Davis, the former shadow Home Secretary, said that using "brains, not brutality" was a better way to extract intelligence information.
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