We got a couple of wooden, aluminium-fronted, sash windows for our loft conversion from Marvin Architectural, Brentford (www.marvin-architectural.co.uk) - a US company. Very good quality, slim profile, powder-coated aluminium facing means they never have to be painted. We also used Henry & Sons, Park Royal (http://henryandsons.co.uk), for doors and a window in an extension, and they seemed pretty good.
D Fox ● 5179d