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Dr Elizabeth Bruton is Curator of Technology and Engineering at the Science Museum. She has previously held roles at Jodrell Bank Discovery Centre; the Museum of the History of Science, Oxford; and the University of Leeds. Interests include the history of communications, military history, museums, and archives. She also blogs at https://geekin9f.wordpress.com/

Newly released MI5 files reveal for the first time that the Portland Spy Ring, one of the Soviet Union’s most successful spy rings in the UK, could have been caught four years earlier if the Admiralty had listened to the ex-wife of one of spy ring’s members.