The Registrar General identifies eight major population centres as conurbations, namely Greater London (12.4% of GB population), West Midlands (inc. Birmingham, Dudley, Coventry, Walsall and Wolverhampton - 4.6% of GB), Greater Manchester (inc. Manchester, Wigan, Stockport, Bolton and Salford - 4.5% of GB), West Yorkshire (inc. Leeds, Bradford and Kirklees - 3.7% of GB), Central Clydeside (inc. Glasgow City and Motherwell - 2.8% of GB), Merseyside (inc. Liverpool, Wirral and Sefton - 2.5% of GB), South Yorkshire (inc. Sheffield and Doncaster - 2.3% of GB) and Tyne & Wear (inc. Sunderland and Newcastle upon Tyne - 2.0% of GB). In total, the conurbations account for 34.8% of the population of Great Britain. Links: Office for National Statistics (ONS).

An extensive urban area formed when two or more cities, originally separate, coalesce to form a continuous metropolitan region.

a large urban settlement which is the result of towns and cities spreading out and merging together.