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We're doing the same for both windows on the first floor, but we're building out the reveal using timber and PIR insulation, as masonry will create a massive cold bridge.
Are you insulating the solid brick wall internally/externally?
ectoplasmosis-
No. They're not insulated anywhere at all so the whole wall is a cold bridge. The windows will be the only insulated part. Got to love Victorian houses. The downstairs extension is ludicrously well insulated - you can almost feel the bulk of it when you're in there, it sort of deadens sound too. But the rest of the house leaks heat terribly.
Sparky
Windows coming out today so they can make good the sides with brick. The new ones will be thin aluminium frames so the bit that housed all the sash gubbins gets bricked up and plastered over. Then we have three or four weeks of OSB windows in the meantime.