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Quincy
NotThamesWater
I reckon. If it's been cemented on, though, it may damage the brickwork when you remove it.
Also worth nothing that some buildings of that ear have slate DPC (also pitch, sometime none).
Taking the plaster off would allow you to see the problem with less stuff in the way, and to see if it dries with the outside fixes.
If it didn't, that's when I'd be thinking about lifting the floor.
Was there no damp when you laid the floor? Do you know what's under there?