HI MY NAME IS GURPREET SINGH. I work for double glazing companies in east london. I am expert Bi-folding doors. I can get you best and quality windows and doors or any kind of glazing work. I do quick and fast service. If you come to me I get you the best deals and fast service. You can visit my place to check material profile and factory area. If you go straight to companies they will charge you extra. But I am middleman for double glaizng companies I get discount then I provide my work to customers.