The map illustrates how well proportional representation using the Single Transferable Vote (STV) could work for the UK Parliament.
Constituencies are based entirely on local authority areas, mostly electing 4 or 5 MPs; this gives a high level of proportionality, while maintaining a strong local connection. In England and Wales it is based as far as possible on traditional (``ceremonial'') counties.
Crown copyright material is reproduced from National Statistics website: www.statistics.gov.uk with the permission of the Controller Office of Public Sector Information (OPSI).
3rd May 2010