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Staple alumaflex to the whole of the roof and walls, tape the joints. Screw tile batten horizontally across the alumaflex fixed into the rafters. Put the tile batten at 400 centres. Plasterboard. Can't make any promises about condensation behind the alumaflex but if taped thoroughly it shouldn't happen.
@diable
I wish I had access above! Basically the room is an attic conversion (although not a conversion, original Georgian) so coming in from the outside it's tiles, tarpaper, battens, beams, lathe and plaster. To insulate traditionally I'd have to take the roof off a three story building..... Not gonna happen.
Has to be done internally unfortunately.