Listed cities in England are the 5 most populated urban areas in each region defined by the 2001 census; listed cities outside England are urban areas with a population over 90,000
Population data & definitions from 2001 UK Census: England & Wales: http://www.statistics.gov.uk/StatBase/ssdataset.asp?vlnk=8271&Pos=2&ColRank=1&Rank=224 ---
Scotland: http://www.gro-scotland.gov.uk/census/censushm/scotcen2/reports-and-data/scotcen8.html --- Northern Ireland: http://www.nisra.gov.uk/archive/demography/publications/urban_rural/ur_gaz.pdf
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