George Blake, who died last year aged 98, is less well known than his fellow spies educated at Cambridge. He was not recruited by his peer group, he operated alone, he was not part of the Establishment and perhaps, as a result, he was treated more harshly than his fellow traitors. An MI6 officer, apparently recruited by the Russians after being captured in 1950 during the Korean War, he was himself betrayed by a defector, Michael Goleniewski, in 1961. Sentenced to 42 years in prison, he escaped from Wormwood Scrubs in 1966 with the help of two peaceniks and an Irish petty criminal and spent over 50 years in Russian exile.