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The National Archives exhibition, 'MI5: Official Secrets', in partnership with MI5 opens to the public. The exhibition, which explores the 115-year history of the intelligence agency, features never-before-seen items from MI5 on public display for the first time. These include a dark leather briefcase left at the Reform Club in London by Cambridge spy Guy Burgess before he fled to Moscow in May 1951; the first camera used by MI5; and the key to the Communist Party of Great Britain's Westminster branch offices.