It pains me to say it, but just do not buy. Whereas I feel like buying British is a good idea, our manufacturing standards compared to German products is woeful. There might well be a 20 year guarantee on Origin windows, but they manufacture the frames, and the fitter marries them up to glass. Try getting any help from Origin when there's a problem with the glass — you can't, you're pushed back to the fitter. And if they were shocking in the first place, there's no point having a 'good' product (which frankly, Origin aren't anyway). Sorry Origin, you need to lift your game and adopt better standards if you're to compete. Do not buy. They will have problems, and sorting those problems out will be painful, if even successful at all. Save yourself the pain I'm now going through and buy something better.