Source:United Kingdom. 1939 Register

In December 1938 it was announced in the House of Commons that in the event of war, a National Register would be taken that listed the personal details of every civilian in Great Britain and Northern Ireland. This Register was to be a critical tool in coordinating the war effort at home. It would be used to issue identity cards, organise rationing and more.

On September 1st, 1939 Germany invaded Poland, putting the wheels in motion for Britain to declare war on the 3rd. On September 5th, the National Registration Act received royal assent and Registrar General Sir Sylvanus Vivian announced that National Registration Day would be September 29th.

Having issued forms to more than 41 million people, the enumerators were charged with the task of visiting every household in Great Britain and Northern Ireland to collect the names, addresses, martial statuses and other key details of every civilian in the country, issuing identity cards on the spot.