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Boundary Commission for England


What data we hold

Electoral Registers – The Commission is supplied with a copy of the full register of electors by each Electoral Registration Officer in England. These are used to ascertain the number of electors in particular geographic areas, which is required to undertake our statutory duty of reviewing constituency boundaries. The full register contains the name and address for all registered electors, and date of birth for some (16 and 17 year-olds who are due to reach the age of 18 during the life of the register). The full register also contains information as to whether an individual has chosen to opt out of having their details included in the ‘edited’ version of the register (which is available for sale by the local authority).

Correspondence to the Commission – The Commission receives a large number of responses to its statutory public consultation during constituency reviews, and also receives a small amount of general correspondence. These will contain the name and address of the person sending us the correspondence.

Protecting Personal Data

Personal data held by the Commission is subject to the provision of Data Protection law currently in force in England. We also have our own Data Protection and Privacy Policy, which provides further details.

There is also specific law that restricts the use of electoral registers. In particular, the Commission is not allowed to supply a third party with a copy of a register it has received (or details of any individual within it), unless expressly provided for in the relevant legislation.

Providing data

Electorate data – As noted above, the Commission uses the electoral registers to aggregate numbers of electors in geographic areas in order to keep the electorate size of constituencies under review. The following spreadsheet summarises the changing electorate size within England between 2010 and 2014 (you can view the data broken down constituencies or by local authority and region): Electorates 2014.

We also maintain more detailed spreadsheets that show the number of Parliamentary electors by ward within each local authority. These more detailed sheets can be made available on request to

Electorate data spreadsheets are updated annually in early March, after we have received a copy of the statutory register from all Electoral Registration Officers in England.

Constituency maps – PDF maps of current constituency boundaries are set out in the Report of the Commission’s Fifth Periodical Review (Volumes 3 and 4). Definitive digital mapping of constituencies is available via the Ordnance Survey ‘Boundary Line‘ product. During a constituency review consultation period, the Commission will make digital shape files of its proposals available for use in Geographic Information Systems.

Freedom of Information – The Commission is committed to the provisions and principles of the Freedom of Information Act 2000 and has produced its own Freedom of Information Policy and Publication Scheme.

If you have any queries or wish to submit a request for information under the Act, please email, or write to: FoI Officer, Boundary Commission for England, 35 Great Smith Street, London, SW1P 3BQ.