Cwmbran Monmouthshire NP44. Double Glazed Windows in Cwmbran Monmouthshire NP44 with A-Rated Windows and Doors. Specialists in PVCu Windows, Doors & Conservatories and the Veka profiles. MPN has been double glazing Cwmbran, Torfaen, Monmouth homes since 1994 – offering the latest home improvements at a price you can afford. Get a Free quote online.