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What were you intending to do with them? Replace them with uPVC? In my conservation area uPVC isn't allowed anymore you need heritage windows and there is no discussion over it.
Why don't you just shelve the windows for now. Do the building work you have permission for and in a year or so you could risk changing the windows for whatever you wanted and then seek retrospective permission. It's easier to ask for forgiveness than permission with things like this.
Received a total fucking spanner in the works with Waltham Forest planning deciding to be a bunch of dicks and saying we need to re-submit planning for our front windows. They are shitty old single glazed lead windows and they want us to replace them like for like. No other house in the entire area has them, everyone has replaced their windows with UVPC. What a bunch of absolute melts. (Yes its a conservation area but why are we the exception?!).