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Hi PW'ers - need some advice on the below. I have a downstairs bathroom that is consistently cold and suffers from condensation on the walls and ceiling which is causing mould and general mustiness. I plan to strip out the bathroom and replace the suite (bath, loo, sink, shower tray and surround) - at the same time I need to replace the ceiling, which is sagging, and insulate the walls somehow in order to keep the room warmer and to prevent the condensation forming on the cold walls. The house is single skin brick built and the bathroom has one external wall, which is what's making the room cold I think. So my current plan is as follows: 1. Replace ceiling with moisture-resistant plasterboard. 2. Renew/upgrade extractor fan 3. Remove existing wall plaster back to bare brick on the external wall and the two internal side walls. 4. Install batten framework on walls to provide insulating air gap. 5a. Install poly vapour barrier then moisture-resistant board on walls or 5b. Install foil-laminated plasterboard onto batten framework instead of using a poly vapour barrier. Which option is most appropriate for a bathroom? 6. Shower cubicle to be clad in Aquaboard. If using a poly barrier, does it need to be installed down to the base of the wall under the floorboards? And would I also need to poly barrier the ceiling too? Finally, I plan to replace the window with a double-glazed unit (currently single-glazed) - when would be the best time to do this - before or after the walls have been finished? As you can see there's lots to do - any advice on the order of events and on which plaster board/insulation options would be really helpful.