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The Cambridge Spy Ring's Sixth Man: Tinker, tailor, soldier ... Irishman?
Newly released MI5 papers have added fresh speculation that second generation Irishman ‘Paddy’ Costello, the son of a Dublin grocer, could have been The Sixth Man in the infamous Cambridge Spy Ring. Writer/researcher
looks at the evidence as to whether he was an Irish nightingale or a carrier pigeon?