In article ,
"Dave" writes:

Also, choose internal glazing.
If the windows are on the first floor, it saves some one from climbing up a
ladder with a mate, trying to get the double glazing unit into the frame.
Much easier from the comfort of the room that is getting the new window.
Also, the ground floor glazing can't be removed from the outside by the
local scallies.

Neither can externally glazed windows done in last few years -- the
glazing units are held in place by window tapes and can't be removed
from the outside.

Internally glazed windows have larger section PVC, which most people
find rather distasteful. In the case of windows with openers, the
PVC sections have to be much bigger, making the window area much
smaller.

--
Andrew Gabriel