Focus on
Olga Gray and the Woolwich Arsenal Spy Ring
In 1938, thanks to years of work by a remarkable female agent, MI5 ensured a package of British defence plans stayed secret.
Series
Government Code and Cypher School: Cryptographic Studies
Catalogue reference: HW 25
What's it about?
HW 25
At the end of the Second World War histories were written of various aspects of the work of the Bletchley Park organisation. Records in the series include volumes covering the breaking of two of the major cypher systems used by the enemy - ENIGMA...
Full description and record details
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Reference (The unique identifier to the record described, used to order and refer to it)
- HW 25
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Title (The name of the record)
- Government Code and Cypher School: Cryptographic Studies
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Date (When the record was created)
- 1920-1978
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Description (What the record is about)
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At the end of the Second World War histories were written of various aspects of the work of the Bletchley Park organisation. Records in the series include volumes covering the breaking of two of the major cypher systems used by the enemy - ENIGMA and TUNNY, photographs of ENIGMA, TUNNY and COLOSSUS machinery, and papers on the development of COLOSSUS.
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Held by (Who holds the record)
- The National Archives, Kew
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Legal status (A note as to whether the record being described is a Public Record or not)
- Public Record(s)
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Language (The language of the record)
- English
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Physical description (The amount and form of the record)
- 38 files and volumes
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Access conditions (Information on conditions that restrict or affect access to the record)
- Open unless otherwise stated
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Immediate source of acquisition (When and where the record was acquired from)
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From 1999 Government Communications Headquarters
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Subjects (Categories and themes found in our collection (our subject list is under development, and some records may have no subjects or fewer than expected))
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Accruals (Indicates whether the archive expects to receive further records in future)
- Series is accruing
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Selection and destruction information (Information about how the record was selected for archiving)
- The entire series has been preserved
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Record URL
- https://beta.nationalarchives.gov.uk/catalogue/id/C15428/
Catalogue hierarchy
Over 27 million records
This record is held at The National Archives, Kew
17,110 records
Within the department: HW
Records created or inherited by Government Communications Headquarters (GCHQ)
You are currently looking at the series: HW 25
Government Code and Cypher School: Cryptographic Studies
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