The Census Act 1800also known as the Population Act 1800(citation 41 Geo. III c.15) was an Act of the Parliament of Great Britain which enabled the first Census of England, Scotland and Wales to be undertaken. The census was carried out in 1801 and has been repeated almost every ten years thereafter. The 1801 census estimated the population of England and Wales to be 8.9 million, and that of Scotland was 1.6 million. Ireland was not included in the census until 1821. The first census of England had been carried out by William I and published in the Domesday Book in 1086. Various other censuses had taken place, such as that in the sixteenth century, in which bishops were asked to count the communicants or number of families in their dioceses. In the latter part of the eighteenth century, there were several proposals for a Census Bill and a growing concern about the population of Britain and its demand for food, particularly fuelled by the publication, in 1798 of Thomas Robert Malthus's An Essay on the Principle of Population. The Census Bill was presented to Parliament on 20 November 1800, passed on 3 December and received Royal Assent on 31 December. The first census was held on Tuesday 10 March 1801. Administration of the 1801 census The idea of a census had been championed, in the House of Commons, by Charles Abbot, MP for Helston, Cornwall, and future Speaker of the House of Commons. Prompted by the 1800 crop failure, which led to significant increases in food prices, a manufacturing recession and mass unemployment, and riots, Abbot believed the crisis could be solved, and future crises averted, by better knowledge of population, "wise legislation and good government". A census, Abbot argued, would enable the government to plan the distribution of grain supplies more effectively. Learning from a 1753 attempt to introduce a individual-level census combined with civil registration of births, marriages and deaths, Abbot's plan was designed to collect only a limited amount of information. Abbot was assisted in his plan by John Rickman who was a clerk in the House of Commons. Rickman subsequently undertook the analysis of the results and the preparation of abstracts and reports from the 1801 census (and the three following censuses). The 1801 census was geared to collecting data on an aggregate rather than an individual basis. Only statistical summaries were to be provided