[1] Available on the HM Treasury website at
http://www.hm-treasury.gov.uk/ppp pfi stats.htm
[2] ONS article, Classification of Metronet, Tube Lines and the London Underground PPP, September 2007, by Martin Kellaway and Helen Shanks
http://www.statistics.gov.uk/cci/article.asp?ID = 1873
[3] Economic Trends, November 2006, "Including finance lease liabilities in public sector net debt: PFI and other", by Adrian Chesson and Fenella Maitland-Smith
http://www.statistics.gov.uk/statbase/Product.asp?vlnk = 14692
[4] Public Sector Finances Statistical Bulletin-September 2009
http://www.statistics.gov.uk/StatBase/Product.asp?vlnk = 805
[5] ONS article, "Public Sector Interventions in the Financial Crisis: Statistical classification decisions", by Martin Kellaway, November 2009
http://www.statistics.gov.uk/CCI/article.asp?ID = 2301&Pos = &ColRank = 1&Rank = 224