The real-life espionage drama, which began in 1983 with a mysterious Moscow death and was followed by the arrest in Britain of a would-be MI5 mole, led to a full-scale internal investigation into the security service and fuelled an escalating diplomatic feud with the Kremlin.
Lord Owen, 85, Labour foreign secretary from 1977-79 under James Callaghan, was publicly and privately scolded by Thatcher for revealing the identity of the new head of MI5, who had been brought in from outside the intelligence services to shake up procedures and improve accountability after a string of high-profile embarrassments.
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