Used a FENSA installer for my bay window costing £4,000. The window leaks at the top from the very beginning under certain weather conditions. I complained and installer strung me along for 6 years, by sending people to "fix" it. Then they denied it was their fault. Why? Because FENSA will only deal with installations under 6 years ago even though the "guarantee" is 10 years. Posted on their Facebook site about this and my post has disappeared. About as useful as a chocolate teapot.
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