1. DEFRA, Department for Environment Food and Rural Affairs. New Bill and strategy lay foundations for tackling climate change; 2008 (accessed July 2008).
2. DTI, Department of Trade and Industry. Meeting the energy challenge: a white paper on energy. TSO Publication, 2007.
3. BERR, Department for Business Enterprise and Regulatory Reform. UK Energy in Brief, National Statistics Publication; 2007.
4. Van Koppen CWJ, Thomas JPX, Veltkamp WB. The actual benefits of thermally stratified storage in a small and medium size solar system. In: Proceedings of ISES solar World congress, Atlanta, USA; 1979, p. 579–580.
5. Low flow operation an advantage for solar heating systems?;Furbo,1987