Christian McArdle wrote:

They are not strictly illegal...building regs basically means you
shouldn't repair to a WORSE standard of insulation...

Installing a new window complete with frame doesn't count as a repair and
must be done to current standard, with some exceptions.

The exceptions basically amount to sheds and listed buildings if you can
convince the council.

Christian.

listed buildings:

I thought you just got the BCO and the Conservation Officer in a room, have
a cuppa, then see who's still standing

Then send the video to Channel Five :-

Cheers

Tim