What was the national register which was set up in December 1938?

The national register set up in December 1938 in the United Kingdom was a comprehensive record of the population, primarily aimed at identifying individuals for military service and ensuring efficient mobilization in the event of war. It collected personal information such as names, addresses, and ages, and was part of the government's preparations for the impending conflict of World War II. The register served as a vital tool for national defense and civil administration during a time of heightened tensions in Europe.