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So the interior floor is concrete and you think it's bridging the DPC?
I obviously haven't seen it in person so it's hard to say for sure but I'd be looking for another cause to be perfectly honest.
If the foundations are ok (this can be an issue in Victorian properties as sometimes they are very insubstantial) then the ground under the floor should be dry. Is the damp problem limited to one part of the wall or all of it? Care to post some photos?
Bobbo-
It's basically limited to this one, fully internal wall, which is the junction of the two reception rooms (knocked through) and the entrance hall, although it's started to creep to the other side of the door frame.
The water main is on the other side of the hall and CH pipes come down from the ceiling in trunking, not on this wall though.
I originally thought it might be residual ground humidity being forced up through the wall by the, now impervious, slab.
Like you say, I should get a few professional opinions on it, though I'm out sure how to go about finding any trustworthy contractors.
Polygon
What would be the usual course of action for remedying a bridged DPC in Victorian property with later concrete floor? I believe that's what I'm dealing with, haven't looked in to sorting it out much yet. Obviously taking the floor out might work, but that's quite a scary prospect.