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Love it when the UK British refer to heat pumps as ‘bleeding edge’ lol.
Well, the underlying heat exchange tech is ancient, but don't the current generation have to be bleeding edge to meet packaging, noise (or lack of) and energy efficiency requirements whilst also working with shitty UK houses and legacy plumbing installations?
A lot of standard tech has been forced into the crappy bleeding edge zone where to meet new standards durability has been sacrificed - see modern gas boilers and ICEs, particularly diesel, for example.
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Got photos of the exterior / interior?
Painting the external walls seals damp in so it tries to get out via the inside surface.
Materials like concrete are porous and will allow moisture to travel into adjoining surfaces.
Modern plasters trap moisture in brickwork until there's enough to pop the plaster off the wall etc...
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Halls not big enough for 1:10 imho - 1/12 on road is probably the safest bet, but the flat pan cars are both as expensive as the M-05 stuff and far more rudimentary (I pitched this as a STEM thing, so I'd hope we'd use something with at least a geared diff!).
Put some electrics in a TT01 I had kicking about and will bring it down for a test drive this Sunday.
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If that damp patch is directly below the cracked / missing pointing above the 'flashing' you could do worse than getting some flash tape and doing a temp bodge until you can get it fixed properly.
Another alternative might be to fix the pointing with CT-1
Both of these bodges, done 'right' could last a good number of years.