In need of some advice, regarding insulation please....I'm just "re-doing" the bathroom..... which suffers from really cold temperatures in the Winter time (surprise, surprise!!), and also condensation/mould growth. Question is..... I'm considering insulating, the outer wall, with something like 25mm Kingspan insulating board, between battens, and then covered, with a plasterboard, and tile finish.... does this sound reasonable..... or will I be adding to the condensation issues..... am also fitting extraction fan to the same wall, and heating the bathroom, with a high mounted, elecric blower heater...... appreciate all comments