Peter Wright on 27 April 1995 aged 78, he was diagnosed as having Alzheimer's disease. Peter Wright Peter Maurice Wright (9 August 191627 April 1995) was a principal scientific officer for MI5, the British counter-intelligence agency. His book "Spycatcher", written with Paul Greengrass, became an international bestseller with sales of over two million copies. "Spycatcher" was part memoir, part exposé of what Wright claimed were serious institutional failings in MI5 and his subsequent investigations into those. He is said to have been influenced in his counterespionage activity by James Jesus Angleton, the US Central Intelligence Agency (CIA) counterintelligence chief from 1954 to
Peter Wright Minister Margaret Thatcher in March 1981. Peter Wright, on the basis of his interviews with Sir Dennis Proctor and his friends, also alleged in his book that Proctor, former Permanent Secretary at the UK Ministry of Power, was at the very least, by Proctor's own account, an unwitting source of secret information to the Soviets via his close friend and Soviet spy Guy Burgess, from whom he had kept no secrets which, in Proctor's opinion, obviated the necessity to recruit him. Wright's sights were also focused on Labour prime minister Harold Wilson, suspicions about whom were initially triggered amongst the