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would you recommend
Be wary of any of my recommendations - I'm just an amateur at this stuff.
I've stripped one of ours back to brick and installed an insulated stud (all because of damp).
Redoing wth lime plaster is the "best" way to do it, but it's a messy job, and not that many plasterers do lime.
Another room isbduento be taken back to brick, but only to waiste height, as we're cupboarding it.
Pre- 20s you may have a pitch layer, a slate layer, or, if you're unlucky, none at all.
Solid walls and lime mortar bring their own problems, as they are more permeable than cement walls, and they need to be and to dry out - cement render and gypsum plaster prevent this happening effectively.