Yeah, Councils can be really bad at requiring people to either replace their old single-glazing with some exactly the same in double-glazed or keep the old inefficient windows. This is understandable for historical buildings but we experienced it with a box office building built in the 1970s, cost us another £11K to get cream coloured uPVC windows instead of white ones.

I think that might change as we go towards energy efficiency, we need to swing the needle back towards more efficiency = good.