19.         DAVID, R. & ALLA, H. Petri Nets and Grafcet – Tools for Modelling Discrete event systems, 1st edition. London and New York: Prentice Hall, 1992.

20.         DAVIS, B. Meltdown! – relating to manufacture for recycling, Engineering, Vol.240, No10. November 1999, pp67-70.

21.         DÉLÉGATION GÉNÉRALE À LA RECHERCHE SCIENTIFIQUE, Geothermal Energy Residential Space Heating (translated by the US Energy Research and Development Administration, Washington) Paris: March 1977.

22.         DEPARTMENT OF ENVIRONMENT, TRANSPORT AND THE REGIONS, A New Deal for Transport: Better for Everyone, The Government’s White Paper on the Future of Transport. London: The Stationery Office for DETR, July 1998.

23.         DEPARTMENT OF ENVIRONMENT, TRANSPORT AND THE REGIONS, Sustainable Regeneration Good Practice Guide: Appendix 1 – Sustainability Checklists. London: DETR, 5 October 1998.

24.         DEPARTMENT OF ENVIRONMENT, TRANSPORT AND THE REGIONS, Breaking the Logjam, The Government’s consultation paper on fighting traffic congestion and pollution through road user and workplace parking charges. London: The Stationery Office for DETR, December 1998.

25.         DEPARTMENT OF HEALTH, Keep Warm, Keep Well – advice for Winter 1999 – 2000. London: Dept. of Health, October 1999.

26.         DEPARTMENT OF TRADE AND INDUSTRY. Photovoltaics in Buildings – A survey of design tools. ETSU Report No S/P2/00289/REP. London: DTI, November 1997.

27.         DEPARTMENT OF TRADE AND INDUSTRY. Photovoltaics in Buildings – Testing, Commissioning and Monitoring Guide. ETSU Report No S/P2/00290/REP. London: DTI, 1998.

28.         DEPARTMENT OF TRADE AND INDUSTRY. New and Renewable Energy – Prospects for the 21st Century, a consultation paper, URN 99/744. London: HMSO for the DTI, March 1999.

29.         DEPARTMENT OF TRADE AND INDUSTRY. New and Renewable Energy – Prospects for the 21st Century, Analysis of the Responses to the Consultation Paper, URN 99/744. London: HMSO for the DTI, July 1999.

30.         DEPARTMENT OF TRADE AND INDUSTRY. UK Energy Sector Indicators 1999, URN 99/193. London: HMSO for the DTI, December 1999.

31.         DONNELLAN, C. issues for the Nineties, Volume 14, ‘Energy Alternatives’,


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