1. European Commission, Towards a European strategy for energy supply, COM, 2000, p. 769.
2. Energy White Paper: Our Energy Future-Creating a Low Carbon Economy,2003
3. English House Condition Survey 2001 Census,2001
4. Housing and Households: 2001 Census,2003
5. T. Williams, Memorandum, Select Committee on Environment, Transport and Regional Affairs 10th Report, 1998.