we haven't actually moved in yet but we got our windows from www.viking.ee and they are basically the same as rationel windows but half the price. the company was set up as a subsidiary of rationel and then the management bought it out. they look great but obviously I can't give a full review of them as we haven't moved in yet. ours were ordered by our builder who has a couple of estonian lads working for them and he's used them in a number of houses he's built in the midlands recently and all the people who've used them are happy.
dereko1969, i would really appreciate your comments on viking windows once you have formed your opinion on the quality etc. we are building a house in longford next year and are starting to source suppliers of windows etc.
There's a company called Kells Windows (website here with contact info only). Haven't dealt with them but have seen their refurbished and replaced sash windows in a few places and they look fantastic.