Ordnance Survey OpenData is rather comprehensive. The licence (AFAIK, IANAL) allows free commercial and non-commercial use, as long as you attribute the data t

Ordnance Survey OpenData is rather comprehensive. The licence (AFAIK, IANAL) allows free commercial and non-commercial use, as long as you attribute the data to them. http://data.ordnancesurvey.co.uk/.html http://data.ordnancesurvey.co.uk/.html It has boundaries for Counties, Cities, Electoral Constituencies and Wards, Civic Parishes, and probably other divisions, too.