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.
Piece
A technical description of COLOSSUS I by D C Horwood, dated August 1973
Catalogue reference: HW 25/24
What’s it about?
This record is about the A technical description of COLOSSUS I by D C Horwood, dated August 1973 dating from 1942 Jan 01 - 1945 Dec 31 in the series Government Code and Cypher School: Cryptographic Studies. It is held at The National Archives, Kew.
Is it available online?
No, this record is not available online. However, you can order a copy. Other ways to view it.
Can I see it in person?
Yes, this record is held at The National Archives and is available to see in person. How to view it.
Full description and record details
-
Reference (The unique identifier to the record described, used to order and refer to it)
-
HW 25/24
-
Date (When the record was created)
-
1942 Jan 01 - 1945 Dec 31
-
Description (What the record is about)
-
A technical description of COLOSSUS I by D C Horwood, dated August 1973
-
Held by (Who holds the record)
- The National Archives, Kew
-
Former department reference (Former identifier given by the originating creator)
-
P/0921/8103/16
-
Legal status (A note as to whether the record being described is a Public Record or not)
-
Public Record(s)
-
Access conditions (Information on conditions that restrict or affect access to the record)
-
Retained Until 2003
-
Closure status (Whether the record is ‘open’ (available to the public) or ‘closed’ (not available due to a legal exemption))
-
Open Document, Open Description
-
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))
-
- Topics
- Intelligence
-
Record URL
- https://beta.nationalarchives.gov.uk/catalogue/id/C11146660/
How to order it
- View this record page in our current catalogue
- Check viewing and downloading options
- Select an option and follow instructions
Series information
HW 25
Government Code and Cypher School: Cryptographic Studies
See the series level description for more information about this record.
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)
42 records
Within the series: HW 25
Government Code and Cypher School: Cryptographic Studies
You are currently looking at the piece: HW 25/24
A technical description of COLOSSUS I by D C Horwood, dated August 1973
You may be interested in
-
-
Focus on
The Spycatcher affair
The book Spycatcher sparked one of the most controversial courtroom battles of the 1980s, bringing questions around state secrecy to a global audience. -
The story of
Anthony Blunt's confession
Security Service files paint a vivid picture of what happened when Anthony Blunt – then employed in the royal household – admitted spying for the Soviet Union.
Related records
Records that share similar topics with this record.