Within days of the 9/11 attacks on the US, the CIA told British intelligence officers of its plans to abduct al-Qaida suspects and fly them to secret prisons where they would be systematically abused. See:
Within days of the 9/11 attacks on the US, the CIA told British intelligence officers of its plans to abduct al-Qaida suspects and fly them to secret prisons where they would be systematically abused.
See: UK intelligence officers knew of CIA’s rendition plans within days of 9/11 – Meeting at British embassy in US raises questions about repeated denials by MI5 and MI6 of connivance in torture (Guardian, link)