2021 United Kingdom census
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| 2021 United Kingdom census | |
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| Name | 2021 United Kingdom census |
| Country | United Kingdom |
| Date | 21 March 2021 (England, Wales, Northern Ireland); 20 February–21 March 2021 (Scotland) |
| Authority | Office for National Statistics (England and Wales); National Records of Scotland; Northern Ireland Statistics and Research Agency |
| Previous | 2011 United Kingdom census |
| Next | planned 2031 United Kingdom census |
2021 United Kingdom census was the decennial enumeration of population and households across the United Kingdom conducted in 2021, replacing the 2011 enumeration and informing planning for NHS England, NHS Scotland, NHS Wales, Health and Social Care Northern Ireland, Department for Work and Pensions, and local authorities including Greater London Authority, Glasgow City Council, Cardiff Council, and Belfast City Council. The operation was led by the Office for National Statistics in England and Wales, the National Records of Scotland in Scotland, and the Northern Ireland Statistics and Research Agency for Northern Ireland, and was affected by the COVID-19 pandemic in the United Kingdom, prompting adjustments reflecting guidance from Public Health England, Public Health Scotland, and Public Health Wales.
Background and planning
Planning began after the 2011 enumeration, with early frameworks drawing on experiences from the 2011 United Kingdom census and international examples such as the 2010 United States Census and the 2016 Canadian census. Stakeholders included UK Parliament, the Department for Levelling Up, Housing and Communities, and devolved administrations like the Scottish Government, the Welsh Government, and the Northern Ireland Executive. Consultations involved bodies such as the British Academy, the Royal Statistical Society, and civic groups including Citizens UK, Age UK, and Stonewall. Technology partners and suppliers negotiated contracts with firms whose previous projects included work for Her Majesty's Revenue and Customs, Transport for London, and the Ministry of Defence. Legal underpinnings referenced the Census Act 1920 and legislative instruments debated in the House of Commons and House of Lords.
Census questions and methodology
Question design incorporated formats trialled by ONS consultations and influenced by international practice from agencies like the United States Census Bureau and the Australian Bureau of Statistics. Topics covered household composition, demographic characteristics, and origins; instruments referenced prior usage in censuses such as the 2001 United Kingdom census and the 2011 United Kingdom census. New or revised items reflected policy interests of the Home Office, Ministry of Justice, and the Foreign, Commonwealth and Development Office including citizenship, migration, and language proficiency used by bodies like UK Visas and Immigration. For England and Wales the form included an updated long-form item set informed by recommendations from the Equality and Human Rights Commission and advocacy groups such as Stonewall and Muslim Council of Britain. Scotland’s instrument aligned with guidance from Scottish Parliament committees, while Northern Ireland’s questions reflected deliberations in the Northern Ireland Assembly.
Data collection and processing
The enumeration used mixed-mode collection combining online returns with paper questionnaires, a strategy adopted following pilots with partners including Arqiva and technology firms that had worked with National Health Service systems. Field operations mobilised thousands of census officers liaising with local offices like Birmingham City Council and Manchester City Council and coordinating with electoral registers maintained by Electoral Commission partners. Cybersecurity and data protection drew on standards from the Information Commissioner's Office and cyber guidance used by GCHQ. Processing pipelines used secure data centres with protocols influenced by practices at Office for National Statistics and National Records of Scotland, and anonymisation techniques comparable to those applied by the UK Statistics Authority.
Results and key statistics
Headline outputs provided population totals, age structures, and household counts informing bodies such as the Department for Education, NHS England, and regional planning authorities including Transport for Greater Manchester and West Midlands Combined Authority. The results revealed shifts in population distribution relevant to media organisations like the BBC, The Guardian, and The Times reporting on growth in urban areas such as London, Birmingham, Glasgow, and Cardiff, and changes in ethnic composition discussed by think tanks including the Institute for Public Policy Research and Resolution Foundation. Data on housing tenure, occupations, and commuting patterns were used by bodies such as Homes England and infrastructure planners from Network Rail and Highways England.
Analysis, impacts, and controversies
Analyses by academic institutions such as University of Oxford, London School of Economics, University of Edinburgh, and University of Manchester examined demographic trends with commentary from policy centres like the Institute for Fiscal Studies and Joseph Rowntree Foundation. Controversies arose over question wording and coverage raised by groups including Liberty, Age UK, and Stonewall, and media debate involved broadcasters such as Sky News and newspapers like The Daily Telegraph. The timing during the COVID-19 pandemic in the United Kingdom generated operational debate referenced in reports to the Public Accounts Committee and influenced comparative studies with the 2020 United States Census and ongoing research at institutes like the Overseas Development Institute.
Administration, costs, and logistics
Administration and procurement were overseen by executive agencies reporting to ministers in the Cabinet Office and the Treasury with scrutiny in committees of the House of Commons and House of Lords. The budget and contract arrangements, including bidder firms with prior public-sector experience, were examined alongside cost assessments by the National Audit Office and audits referencing standards used by Audit Scotland. Logistics involved coordination with transport operators including Royal Mail and local authority distribution networks such as those run by Leeds City Council and Belfast City Council to deliver stationery and guidance materials.