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Yeah that was me. Two external walls in the corner of the house. 25mm insulation bonded to plasterboard. I stripped the plaster back to brick, fixed 25mm roofing battens then screwed onto those. The walls are noticeably warmer and the room holds its temperature better than the other bedrooms. I'm very happy I did it, especially with his bed tucked in the corner. In hindsite, I wouldn't have bothered stripped back to brick, it only gained around 25mm iirc, and it was a lot of mess and the bulk of the hard work.
Hovis
apc
Was it @Hovis who stripped back their kids wall and then battoned and insulated with really thin insulation boards?
Obviously more than 8mm and more. Invasive, but you can work out what benefit is expected.