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gillies
@Mr_Smyth
"Fitting insulated plasterboard around the reveal”
just be aware of the thermal changes in that area and sealing properly to avoid any interstitial condensation. I would use spray foam adhesive and ensure a continuous bead to enclose any areas behind. Legally you may need fixings but you can use less with foam than dot/dab, this is because it’s a fire risk with the boards falling off the wall and blocking escape.
If you are removing the window boards then a good look at the cavity closer to see if it’s worth fitting it properly and a modern version? all depends on the age and construction of your building.