A 110-year-old lemon used by a German WW1 spy to send secret messages from Britain with invisible ink is going on display in ...

Featuring declassified documents and objects from MI5's private collection, the exhibition marks the first time the ...

A briefcase left behind by infamous Cambridge spy Guy Burgess as he fled to Moscow in 1951 is among never-before-seen MI5 ...

The MI5: Official Secrets exhibition, which features objects from MI5's private collection alongside declassified documents, ...

The exhibition "MI5: Official Secrets" marks an unprecedented collaboration between the intelligence agency and The National Archives, offering the public a first-ever glimpse into MI5's classified ...

A shrivelled lemon at the centre of a First World War spy drama is among dozens of items throwing new light on the secret ...

A battered leather briefcase left behind by Guy Burgess when he fled to Moscow in 1951 is among 20 objects from MI5's ...

Burgess's British passport is also being exhibited for the first time. He was a member of the Cambridge Five spy ring and fled to Moscow with fellow spy Donald Maclean in 1951 due to fears of ...

He was a member of the Cambridge Five spy ring and fled to Moscow with fellow spy Donald Maclean in 1951 due to fears of being discovered. None of the Cambridge Five were ever prosecuted for spying.