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Concrete? At a guess I imagine it was done by the owner before last but I'll confess I didn't give it enough thought or investigation at the time of purchase.
I'll try and lift a bit of the laminate at some point and have a look. What would I be on the look out for? Cracks?
Another option I'm considering is the quite drastic one of structural remodeling of the space to make it open plan to the hallway, doing away with this wall completely. Would require extending an RSJ insulating the end wall (end of terrace) but I want to do the latter anyway.
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 flooringVentilation sounds like it's satisfactory by your account but condensation damp is always possible
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Concrete?
Ugh.
As @Vesalius says, a recipe for trouble. If it's limecrete, it may be more forgiving, but if it's cement, ugh. That probably depends on when it was laid.
Removing the wall would certainly stop the wall from being damp - but there would still be damp in your floor. Whether it would still be a problem or not is another thing.
Lifting flooring, digging holes, stripping plaster to the brick - Edges and corners are the likeliest places to look. Tells are damp underflooring, blown / fluorescing paint & plaster, rusty nails, crumbling / peeling etc...
Re: ventilation. If it were a suspended floor, then more airbricks could help (allowing the brick / ground below the DPC to dry). As it is, additional ventilation would probably only make the symptoms less visible.
Vesalius
NotThamesWater
Looking under the floorboards & finding out what is going on should be the first action, before considering a solution. How is the water getting in, how is it spreading etc....
(But yeah - injection is probably a waste of money).
[Edit] solid floors? Is that a more recent change? What are thye made of?