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Of course both Jonathan and Mel are right.

Thanks Amanda for raising an important aspect of the energy certification of buildings - the expensive privatisation of knowledge. The multi-disciplinary Edge (www.edgedebate.com) will always argue for the measurement of the energy performance of public (and private) buildings and the publication of the results. More broadly we would argue that any publicly-funded research should be freely available for the greater good, the reduction of waste and progress towards zero carbon. Of course any methodology should be as robust as possible but we would all benefit from free access to the software. The best solution would be to renationalise the BRE so that we have the national research body we all so badly need.

Robin Nicholson