The ripping out of the bathroom was a deviation from the plan caused by us having a skip for 3 weeks and needing to maximise what we could get in to it. The proper job that we are working on is the installation of breathable limecrete and flagstone floors in the Sitting Room and Hallway.
The first part of the process is to drop the level of the solid earth floor by 6 or 7 inches to create a moisture barrier of non-wicking expanded glass 'stones' called Glapor. This stops any moisture from directly contacting the limecrete layer but allows it to breathe/evaporate slowly.
The Sitting Room floor is comprised of VERY hard packed clay and stones, and has been a back-breaking job to dig out with a mattock and shovel.
It took 3 days to dig the floor down to a fairly uneven level because my back isn't as strong as it could be (poor lifting posture is taking its toll) and I'm of the opinion that there's no sense in overdoing things...!
The earth which was removed from the floor was, in places, still very damp despite this room having not had any flooring other than dirt for many months.