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Microfilm copies of "ULTRA" signals

Reference Code: GBR/0014/ULTR

Scope and Contents

Consisting of intelligence from intercepted enemy communications, forwarded from the Admiralty to Allied Commands, "Cairo Series", June 1942-September 1943.

Generally being decrypts from the Government Code and Cipher School at Bletchley Park, Buckinghamshire, using the Enigma machine. The Enigma signals were given a special security classification, "MSS" (Most Secret Source) or "ULTRA".


  • Creation: 1942-06 - 1943-09

Conditions Governing Access

The collection is open for consultation by researchers using Churchill Archives Centre, Churchill College, Cambridge.

Conditions Governing Use

Researchers wishing to publish excerpts from the papers must obtain prior permission from the copyright holder(s) and should seek advice from Archives Centre staff.


10 archive box(es) : microform

Language of Materials


Other Finding Aids

A copy of this finding aid is available for consultation at Churchill Archives Centre, Cambridge and the National Register of Archives, London. A typescript box list of the microfilms is available at Churchill Archives Centre.

Immediate Source of Acquisition

The microfilms were presented to Churchill Archives Centre by Mr Ralph Bennett in January 1990

Existence and Location of Originals

Public Record Office, Kew, London, references: DEFE 3/758-764, 766-770, 772- 831 & 871-877


This collection (fonds) level description was prepared by Andrew Riley of Churchill Archives Centre in July 2003.



2003-08-01 13:57:58+00:00
Language of description
Script of description

Repository Details

Part of the Churchill Archives Centre Repository

Churchill Archives Centre
Churchill College
Cambridge Cambridgeshire CB3 0DS United Kingdom
+44 (0)1223 336087