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WER’s were introduced in the UK around 2004 and are issued for the thermal efficiency for the whole of the double glazed window units that are fitted into any conservatory. (Not just the double glazed panes).
What directories do not have, is an understanding of the company that is advertised on their list, it’s just a name and a number. A directory cannot make a judgment on the trustworthiness or the experience and track record of the installer or give low cost conservatory prices.