The UK identity card was issued at the start of the Second World War by the National Registration Act. The National Register began in September 1939 with the requirement that the identity card be produced on demand or presented at a police station within 48 hours. Initially, identity cards were a brown colour, with blue cards being issued to adults in 1943. Government officials carried green cards with a photograph. The card was abolished by the new Conservative government on 21 February 1952.