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You can potentially test the soil pipe yourself for £10 worth of drain bung. Google drainage water drop test.
Hefty-
That sounds like a job I'd be willing to pay someone for.
Curiously, and vaguely related my connection to the sewer appears to be open at the front of my house, I can hear water running when someone's in the shower, there's what looks like an inlet embedded half way in to the wall between my vestibule (can't call it a garden, it's a 1m strip of concrete) and the road. Will probably have to explore that if I ever get around to knocking that wall down. Never smelt sewage out there though.
Polygon
That moisture is just coming from groundwater I think, forced up through the only porous bit of the floorplan left.
I had our water feed in replaced to decommission the leaking pipe. All heating pipes come down the walls, that's the only thing I can think that's left unless our soil pipe is cracked under there.
Actually I should probably get that checked by one of those remote camera guys.
Knocking down the wall and replacing with steel & stud wall would probably be less destructive than ripping out the concrete floor.