Britannia windows installed a composite front door and windows. During the colder months, condensation now occurs at the foot of the door. This was reported to Britannia Windows. After a couple of visits by their surveyor, he advised that: 1) It was not normal for condensation to appear at the foot of a door and he had never seen the issue before. 2) The door is warped. 3) Part of the rubber seal at the foot of the door was missing (which he did repair). 4) The gap between the door and the frame at the top and bottom of the door is too big (it should be approx. 3mm and not 8mm). He advised that the issue is caused by the large gap. Even though they have admitted issues with the door, they have not resolved the issue. They do not return telephone calls or emails and do not respond or follow their own complaint procedure. They are unprofessional and incompetent, and I do not recommend this company.