Middle Layer Super Output Area

Middle Layer Super Output Area
Name	Middle Layer Super Output Area
Settlement type	Statistical geography
Country	United Kingdom
Established title	Introduced
Established date	2004

Contents

Middle Layer Super Output Area

A Middle Layer Super Output Area is a standardized statistical geography used for reporting small-area statistics in England and Wales, created to provide consistent units for analysis by agencies such as the Office for National Statistics, Department for Work and Pensions, Ministry of Housing, Communities and Local Government and local authorities including Greater London Authority and Kent County Council. It sits between lower-level units employed by bodies like the Census of the United Kingdom and higher-level units used by organisations such as Eurostat, United Nations and the World Bank, enabling linkage with datasets from institutions including the British Medical Association, Public Health England and the Land Registry.

Definition and purpose

A Middle Layer Super Output Area was defined by the Office for National Statistics and the Ordnance Survey to create intermediate zones between Lower Layer Super Output Area and administrative divisions such as districts of England and Unitary authority (United Kingdom), with the purpose of producing stable time-series for publications by entities like the National Health Service (England), the Valuation Office Agency and the Department for Education. Designed to support statistical releases such as the Census of the United Kingdom outputs and health indicators from the National Institute for Health and Care Excellence, the areas permit consistent aggregation for studies conducted by organisations including British Geological Survey, Historic England and the Environment Agency.

The concept was developed by the Office for National Statistics and implemented after consultations with stakeholders including the Local Government Association, the Audit Commission and the Royal Statistical Society following earlier small-area schemes such as electoral ward (United Kingdom)s and parish. The first release coincided with the 2001 United Kingdom census outputs and was refined ahead of the 2011 United Kingdom census through collaboration with the Ordnance Survey, the Census and Statistics Advisory Committee and academic centres like the London School of Economics and the University of Oxford.

Middle Layer Super Output Areas are composed of groups of Lower Layer Super Output Areas and are constrained by features recorded by the Ordnance Survey such as major roads and rivers, and by administrative units like civil parishs, Metropolitan boroughs and Historic county. Boundaries are designed to be stable across releases to facilitate comparisons used in reports by the Home Office, the Ministry of Justice and the Crown Prosecution Service, while also reflecting population distributions recorded by the Census of the United Kingdom and address registers maintained by the Valuation Office Agency.

Middle Layer Super Output Areas are widely used for reporting indicators by the Public Health England profiles, crime statistics published by the Home Office, educational attainment statistics from the Department for Education and socio-economic measures compiled by the Office for National Statistics. They are applied in analysis by academic institutions including the University of Cambridge, University College London, Imperial College London, consultancy firms like KPMG and Deloitte, and non-governmental organisations such as the Joseph Rowntree Foundation and the Resolution Foundation for policy research, health equity studies by the Royal College of Physicians and planning applications considered by the Ministry of Housing, Communities and Local Government.

Construction of Middle Layer Super Output Areas follows rules established by the Office for National Statistics using population and household counts from the Census of the United Kingdom, address-based registers maintained by the Ordnance Survey, and quality-assurance processes guided by standards from the International Organization for Standardization and methodologies referenced by the Royal Statistical Society. Aggregation rules ensure compatibility with indicators used by the National Health Service (England), the Environment Agency flood-risk statistics, and socio-economic measures such as the Indices of Multiple Deprivation produced by the Department for Communities and Local Government.

Compared with Lower Layer Super Output Area, Middle Layer Super Output Areas are larger and intended for reporting by organisations including the Office for National Statistics and the European Commission's statistical office Eurostat, whereas administrative units like counties, districts of England and Unitary authority (United Kingdom)s are designed for governance by bodies such as the Local Government Association and the Association of Directors of Public Health. Internationally, they serve a role analogous to statistical units used by the United States Census Bureau, Statistics Canada and Australian Bureau of Statistics for cross-national studies by institutions like the World Health Organization.

Critics including researchers at the London School of Economics and campaigners such as the Joseph Rowntree Foundation note that Middle Layer Super Output Areas can obscure local variation important to organisations like the National Health Service (England), the Metropolitan Police Service and community groups, and may not align with electorates represented in Parliament of the United Kingdom constituencies or with historical identities preserved by Historic England. Others, including analysts from Shelter (charity) and academic teams at the University of Manchester, point to issues with temporal stability when boundaries are revised between censuses, challenges for delivery organisations such as the Royal Mail and limitations when integrating new datasets from bodies like the Land Registry or the Driver and Vehicle Licensing Agency.

Category:Geography of the United Kingdom