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From 1935 to 1971 civil defence in the United Kingdom was the responsibility of the Civil Defence Department and resulted in the establishment during 1957 of the United Kingdom Warning and Monitoring Organisation. On the run-down of civil defence in 1971 the department was replaced by the Home Defence and Emergency Services Division of the Home Office.

The senior official of the department was the Director-General of Civil Defence, also known as the Inspector-General.

Senior officials:

Director-General of Civil Defence

Director-General of Civil Defence Training

Inspector-General of Civil Defence

Secretary

Deputy Under Secretary of State

Under Secretary