The head of Britain's communications intelligence agency GCHQ has taken delivery of a set of unique Enigma machines at a ceremony in Toledo, Spain.
Much is known about the success of codebreakers at Bletchley Park during the Second World War but these machines provide a key part of the largely unknown story of how codebreaking during the Spanish Civil War lay the foundation for what came after.
Security correspondent Gordon Corera was at the ceremony in Toledo and hears how they were discovered in a locked basement in Spain's Ministry of Defence having been there since the 1930s.
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