I didnt know that Wrights were closed. Shame really, they were good to deal with. The windows I got from them are branded "Eurosash" which are apparently manufactured by this lot. http://www.dungannonwindows.co.uk/. According to their website, they only supply to trade, but will give you a list of their approved installers if you get in touch. When I was looking for my windows I noticed that a lot of the showrooms I seen all had the same "Eurosash" windows. Wrights were the cheapest at the time.
Be careful too of what glass you get in your windows. Less energy efficient glass will be much cheaper.