They give you 4 quotes done in a very timely fashion and have access to lots of companies who can do the double glazing for you. Their website is user friendly and very easy to read. They have a form for you to fill in your information and you can get a quote in a short amount of time. They also have many articles about double glazing. Why it's important? Can you qualify for a grant for it? What are the standards for it? Is triple glazing really necessary? All these questions are answers that you can find on the front page of their site.
If you are thinking it's time to get those windows and doors repaired make sure you check this site out first. They will answer your questions, give you quotes and make sure your needs get met!