As war approached, preparations were made to enable a national register to be rapidly compiled and identity cards issued. A National Registration Bill was quickly introduced and royal assent given on the 5th September 1939, just two days after the declaration of war and a few days later it was announced that National Registration Day would be Friday September 29th 1939.

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Approximately 46 million cards were issued

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Initially, the card had to be produced to a policeman on demand or alternatively within 2 days at a police station. Further regulations were also issued requiring notification of change of address, also for births so a card could be issued for the newborn, also surrendering of the card if the person dies.

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