The Parliamentary Office of Science and Technology has published its Future Energy Efficiency Policy document which outlines the benefits and costs of future improvements in energy efficiency across various UK sectors. It then describes the barriers to energy efficiency measures, outlines options for future policy and summarises analyses of the effectiveness of various options.
http://image.email-cibse.org/lib/fe9c13727463047c74/m/1/0f412841-9087-4152-9f06-08a1ae310997.pdf