A top-secret document revealing how MI6 and MI5 officers were allowed to extract information from prisoners being illegally tortured overseas has been seen by the Guardian. The interrogation policy ... instructed senior intelligence officers to weigh the importance of the information being sought against the amount of pain they expected a prisoner to suffer. It was operated by the British government for almost a decade. The fact that the interrogation policy document and other similar papers may not be made public during the inquiry into British complicity in torture and rendition has led to human rights groups and lawyers refusing to give evidence or attend any meetings with the inquiry team because it does not have credibility or transparency". The decision by 10 groups - including Liberty, Reprieve and Amnesty International - follows the publication of the inquiry's protocols, which show the final decision on whether material uncovered by the inquiry, led by Sir Peter Gibson, can be made public will rest with the cabinet secretary. Some have criticised the appointment of Gibson, a retired judge, to head the inquiry because he previously served as the intelligence services commissioner, overseeing government ministers' use of a controversial power that permits them to "disapply" UK criminal and civil law in order to offer a degree of protection to British intelligence officers committing crimes overseas.