One of the houses on my street of victorian terraces has just been
"refurbished" which has included the replacement of wooden sash
windows with nasty plastic casement ones.

I think I'll contact the relevant department at the local council
tomorrow. Somehow I suspect they won't do very much. Even if they do
take an interest it would be very easy for the developer to say that
the windows have been in there for a while (the street was only
designated as a conservation area about five years ago). Anyone have
any experience of this type of thing?

The glass will have date codes so the council will be able to check. If the
fail to act then report them to the Local government ombudsman.

Peter Crosland