<P> The census in the United Kingdom is decennial, that is, held every ten years, although there is provision in the Census Act 1920 for a census to take place at intervals of five years or more . There have only been two occasions where the census has not been decennial: There was no census in 1941 due to the war; and a mini-census using a ten percent sample of the population was conducted on 24 April 1966 . There are actually three separate censuses in the United Kingdom - in England and Wales, Scotland, and Northern Ireland, although they are often coordinated . From 1821 until 1911, the census included the whole of Ireland . </P> <P> The census records which have been published relate to the occupants of each household on the date given below: </P>

How often do they do a census uk