In message , Dave W
writes

Another thing I was careful to avoid is non-flat glass, which I often see.
It doesn't affect the view through it, but the reflections off it make it
look like plastic windows on a dolls house!

Tangent alert! Our windows are all still original Victorian sash, and
many panes (with flaws) are probably original, too. One bedroom window,
at the front, is odd. Traditional sash, with four panes of glass, yet
one of the four always looks as though it is not there, from outside. It
just looks dark, and you would think the whole pane was missing. Looking
out, from the bedroom, it looks exactly like the other three. No idea
why.

--
Graeme