Radio Department: Post Office Registered Files.

Catalogue reference: DO 160

Date: 1955-1966

This series contains files produced by the Communications Department and its successors relating to Commonwealth communications matters generally...

Catalogue reference: HW 1

Date: 1844-1945

This series contains summaries of selected signals intelligence reports, issued by the Government Code and Cypher School and sent by the head of...

Catalogue reference: FCO 14

Date: 1967-1973

This series contains the records of the departments of the Foreign Office and the Commonwealth Office, and their successors, which dealt with...