Only 7% of Which? members trust double glazing companies. Not that surprising when they're renowned for dubious selling techniques, and steep price drops are a familiar part of the sales patter. (more about double glazing companies...)

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Making massive discounts may be the oldest sales trick in the book – but it’s a tactic that’s still working for the double glazing industry. Is a straightforward quote really too much to ask for? (more about double glazing sales tricks...)

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