The
nw6 disadvantage in uPVC is it is
NW6 not quite as attractive as traditional wood. Though they still come primarily in white, [[
https://www.repairmywindowsanddoors.co.uk/kilburn-windowrepair/ nw6]] there really other CR3 colors to choose from. Some
Nw6 have
HA5 wood finishes as well, KT14 though
RH16 they are not quite such as the real thing.