We had our upstairs windows replaced by Derwent earlier this year and everything about the process has been first class. The products are excellent, the workmanship of a very high standard and we absolutely delighted with the results. People have been stopping us in the street as we leave the house to ask us about our lovely new windows. From our initial enquiry through to the end of the installation we couldn’t fault anything and look forward to returning for the rest of the windows as soon as possible.