This group of records is concerned with defence communications and intelligence, mainly for the period during and after the Second World War.
Postal and telegraph censorship records are in DEFE 1.
Some teleprinter messages based on coded radio transmissions from enemy forces are in DEFE 3.
Registered files of the Directorate of Scientific Intelligence are in DEFE 21, with reports and memoranda from the same directorate in DEFE 44.
Scientific and Technical Liaison Branch records are in DEFE 41 and record cards of foreign scientists are in DEFE 43.
Directorate of Forward Plans' records are in DEFE 28.
Registered files of the Defence Intelligence Staff are in DEFE 31 and DEFE 61.
Minutes and papers of the Defence Signal Board and predecessors are in DEFE 59, and registered files of the Defence Signals Staff are in DEFE 26.
Relations with the media are dealt with in DEFE 53.
Intelligence assessments reports and memoranda in are DEFE 60, DEFE 62, DEFE 63 and DEFE 64.
Reports and papers from intelligence conferences and working parties are in DEFE 65.
DEFE 66 contains miscellaneous documents from the Joint Intelligence Bureau and the early days of DIS.DEFE 60