Seyward recently replaced all of the double glazing in my house, including a very large patio door. Overall, they provided a very good service and the quality of product and standards of workmanship were very high. One slight quibble is that they did tell us they would put two teams on the job to complete it in a day but only one team turned up, taking 2 and a half days. However, they were very responsive when we said we weren't happy with one of the windows and will be replacing it completely this week.