Secretary of State for Defence (UK)

The position of Minister for Co-ordination of Defence was a British Cabinet-level position established in 1936 to oversee and co-ordinate the rearmament of Britain's defences. It was established by the Prime Minister, Stanley Baldwin in response to criticism that Britain's armed forces were understrength compared to those of Nazi Germany. The criticism had been led by Winston Churchill and many expected him to be appointed as the new minister. Baldwin's choice of the Attorney General Sir Thomas Inskip for the post provoked widespread astonishment. The appointment is now regarded as a sign of caution by Baldwin who did not wish to appoint someone like Churchill who would have been interpreted by foreign powers as a sign of the United Kingdom preparing for war, as well as a desire to avoid taking on board a controversial and radical minister.

In 1939 Inskip was succeeded by First Sea Lord Lord Chatfield. When the Second World War broke out, the new Prime Minister Neville Chamberlain formed a small War Cabinet and it was expected that Chatfield would serve as a spokesperson for the three service ministers, the Secretary of State for War, the First Lord of the Admiralty and the Secretary of State for Air; however, political considerations resulted in all three posts being included in the Cabinet, and Chatfield's role proved increasingly redundant. In April 1940 the position was formally wound up and the functions transferred to other Ministers.

The post of Minister of Defence was responsible for co-ordination of defence and security from its creation in 1940 until its abolition in 1964. The post was a Cabinet level post and generally ranked above the three service ministers, some of whom, however, continued to also serve in Cabinet.

On his appointment as Prime Minister in May 1940, Winston Churchill created for himself the new post of Minister of Defence. The post was created in response to previous criticism that there had been no clear single minister in charge of the prosecution of World War II. In 1946, the post became the only cabinet-level post representing the military, with the three service ministers – the Secretary of State for War, the First Lord of the Admiralty, and the Secretary of State for Air, now formally subordinated to the Minister of Defence.