I can’t recommend a brand as such, but I can recommend a window company. It’s a family run business and service is fantastic and they won’t rip you off. They were recommended to us and we've had several windows changed and I’m really pleased. I’m not sure buying windows from a manufacturer and then paying a fitter to fit them is that much cheaper? They are based in Beds and London. Phil Bush is such a nice guy. Here are their details, and they have a Facebook page as well as a website if you want to read their reviews.

We’ve had a UPVC door and some (timber) secondary glazing fitted by Everest who were not the cheapest when we looked at quotes but the quality of the products and fitting is undeniable and the aftercare was perfect.

Veka

Thanks Sonia, I'll check them out.

Everest is one of those big firms I want to keep distance. Thanks for mentioning them anyway.

Veka has come under my radar among a couple of other german brands, it seesm the problem is the company that get their profiles and matches with furniture that is nog good quality so besides the brand, also the factory that put everything together is another variable in the equation to find a good window. definitely not the easiest thing task so far, not as easy as I hoped to go somewhere and buy something that is exactly what it says on the box

Kommeling