Four years after Kim Philby’s defection to Russia The Sunday Times’s Insight team tracked him down and unearthed a photo of the “Third Man” in Red Square.
The investigation revealed that Philby was “by a shatteringly wide margin, the most important Soviet agent ever to penetrate the Western intelligence system”.
The Sunday Times revealed: “He was groomed as head of Britain’s intelligence system and, as link man with the American Central Intelligence Agency, had almost total knowledge of all Western intelligence operations against Russia.”
Email pged@pressgazette.co.uk to point out mistakes, provide story tips or send in a letter for publication on our "Letters Page" blog