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An unprecedented look inside MI6 - Britain's Secret Intelligence Service, which marks its centenary this year. BBC security correspondent Gordon Corera talks to senior intelligence officers, agents and diplomats as well as their former arch enemies about the shadowy world of espionage. Programme One - Gadgets & Green Ink explores the early years of MI6 - set up by Sir Mansfield Cumming, an eccentric and formidable figure known as 'C' who signed his name in green ink. The highs and lows of the two world wars and details of some of the gadgets any self respecting agent could not do without.
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