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LONDON, ENGLAND - MAY 17:  A rainbow flag flies alongside a Union Jack outside the MI6 building in support of International Day Against Homophobia on May 17, 2016 in London, England. The rainbow flag is commonly associated with gay rights and the International Day Against Homophobia started in 2004, with people across the globe celebrating gay rights. The MI6 building at Vauxhall is the headquaters of the British Secret Intelligence Service (SIS).  (Photo by Chris Ratcliffe/Getty Images)
LONDON, ENGLAND - MAY 17:  A rainbow flag flies alongside a Union Jack outside the MI6 building in support of International Day Against Homophobia on May 17, 2016 in London, England. The rainbow flag is commonly associated with gay rights and the International Day Against Homophobia started in 2004, with people across the globe celebrating gay rights. The MI6 building at Vauxhall is the headquaters of the British Secret Intelligence Service (SIS).  (Photo by Chris Ratcliffe/Getty Images)

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    Former MI6 chief: 'Diversity is absolutely crucial'

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Former MI6 chief: 'Diversity is absolutely crucial'

John Sawers, former Head of the UK Secret Intelligence Service, tells Christiane Amanpour why diversity is so important in the modern intelligence world.

Former MI6 chief: 'Diversity is absolutely crucial'

John Sawers, former Head of the UK Secret Intelligence Service, tells Christiane Amanpour why diversity is so important in the modern intelligence world.