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Polygon
Concrete flooring in a period property sounds like a recipe for trouble. Funneling moisture underneath the property through to the nearest escape point, the surrounding walls
Would it have had a suspended timber floor previously do you think?
Or if it was a solid floor before it would have most like been breathable.
The plaster on the walls - lime or cement/gypsum ?
The latter plaster might exacerbate the issue caused by the flooring
Ventilation sounds like it's satisfactory by your account but condensation damp is always possible