1 - The first UK census was in 1801 carried out partly to ascertain the number of men able to fight in the Napoleonic wars.
2 - Since 1801 censuses have taken place every ten years with the exception of 1941, due to the Second World War.
3 - The first four censuses (1801-1831) were mainly statistical and contained virtually no personal information.
4 - The 1841 census was the first to record names of all individuals in a household.
5 - In 1911 the Women's Freedom League, a suffragette organisation, launched a campaign to boycott the census. They encouraged women to go to all-night parties or stay at a friends house to avoid the census.
6 - In 1966 the UK trialled an alternative form of enumeration known as the "longform/short form whereby every household was given a short form to complete, while a sample of the population had to complete a longer, more detailed, form.
7 - In the last census (2001) 94% of the population completed it with a further 4% completed as a result of a follow up by census enumerators .
8 - The current fine for refusing to complete the census is up t o£1,000
9 - The 2011 census is the first that has the option to be completed online.
10 - There are 56 translation booklets available in various languages but the actual questionnaire must be completed in English