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Howard
Looks like it.
My money is on a few tonnes of rubble & general crap under the suspended floor, breaching the DPC, that they have covered in a nice non-breathable laminate. And any air-bricks have been covered up too.
re: Fire doors - You can get away with none if you do things like installing a must / fire repression system (Or just say that you are going to on the plans...).
You only need them on the protected stairway too, not necessarily on all doors.