Mike Mitchell wrote:

And £12,000 is roughly 30 years of heating bills! I'd rather keep my
slimline steel windows, maybe with double-glazed panes, which
Crittalls can supply nowadays, than put in some horrid, ugly PVC
replacements. I don't think I have seen any modern replacement windows
that look "nice".

Another take - our 8 windows cost ~£1600 including fitting, and have
made a very large difference to the heating mainly by reducing draughts.

I love our clean uPCV windows which open and shut properly and keep us
warm. They're great. And I don't think they look out of place on our old
cottage at all.

--
Grunff