On the 29th September 1939 a Survey Nicknamed 'The UK's Instant Census' took place. The findings were used to issue Ration Cards and Identity Cards. The details requested were:-
Name Sex Age Occupation Address Marital Status
Individual Returns for England and Wales are now being digitised and are expected to be released next month containing 40 Million entries. They are highly valuable as they plug a 30 year gap between the 1921 and 1951 Census. The 1931 Census was destroyed in a Fire and there was no 1941 Census because of WW2. The National Register formed the basis for the NHS founded in 1948. The 1921 Census will be released in 2022.