The Registrar General John Rickman conducted the first census of Great Britain's population, and was responsible for the ten-yearly reports published between 1801 and 1831. During the first 100 years of census-taking the population of England and Wales grew more than threefold, to around 32 million, and that of Scotland, where a separate census has been carried out since 1861, to about 4.5 million.

From 1911 onwards rapid social change, scientific breakthroughs, and major world events affected the structure of the population. A fire that destroyed census records in 1931, and the declaration of war in 1939, made the 1951 census hugely significant in recording 30 years of change over one of the most turbulent periods in British history.

Elizabeth II (Elizabeth Alexandra Mary; born 21 April 1926) has been Queen of the United Kingdom, Canada, Australia, and New Zealand since 6 February 1952. Her first census as Queen was in 1961 and there have been five more since then with the last one being in 2011. In total she has been the Queen through six censuses.

More Info: en.wikipedia.org