Population Estimates by Ethnic Group (experimental) / National Statistics, 11 October 2007
http://www.statistics.gov.uk/StatBase/
Product.asp?vlnk=14238&Pos=1&ColRank=1&Rank=272
"Population estimates by ethnic group are available for mid-2001 to mid-2005 for England and constituent administrative areas (Government Office Regions, counties, local authority districts), by age and sex. Broad components of population change are also shown for England only."