Baroness Manningham-Buller said she only discovered that Khalid Sheikh Mohammed had been waterboarded 183 times when the US Justice Department released a memo last year and it was reported in the press.
She also said that MI5 had protested to the Americans about their treatment of detainees at one stage but declined to go into details.
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In a lecture at an event organised by the Mile End Group, she said she had wondered, in 2002 and 2003, how the US had been able to supply the UK with intelligence from Mohammed.
Full story: US hid waterboarding of 9/11 accused, says former MI5 chief – Telegraph