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No idea, but it sounds like a nightmare of a job that you'd only consider after all other avenues have been tried.
Is the concrete floor attached to the inner brickwork? Is that how the original DPC has been bridged?
Howard-
Yeah the concrete is poured right up to the wall so the existing DPC is either bridged, failed or just doesnt exist (fully internal pier so I could see how this would be the case). Plastic DPC at the edges of the floor but that isn't where the issue is. Most of the external walls are also plastered in gypsum and don't have the same problems. To complicate matters the electricity feed comes up by the base of the pier so that's either the cause for the DPC failure or at least makes fixing it more complicated. I guess this feed is not original but went in before the floor.
At the moment by best option looks like live with it and sell the place as soon as we can afford to, it's far from the only issue with the house.
Polygon
Anyone had experience of retrofitting a physical DPC in a wall?* Pretty sure mine original DPC is bridged in a way that would make it unfeasibly destructive to cure (concrete floor in Victorian building) unsurprisingly DPC injections have done nowt. Not sure given the non-period floor that the heritage/lime plaster approach would work.
*Just to be clear I would GSI not DIY lest my house falls down.