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A fair amount of what I said was with page 1741 in mind (I don't know how that ended). You're clearly after something different. And I am being pessimistic but foundations footings maybe almost non existent (distance memory of reading regs introduced ~1903), my only other thought was if the ground is of a type (clay) that would be prone to drying and having deep cracks that the concrete covering would have been added to prevent that..
The new image does show that the concrete might be a much greater depth- I think to start, Id be looking at trying to preserve the concrete 8" away from the house at 45° down and away = an angle grinder..
bluehuw
I’m not sure it is supporting the walls. I think over time it’s been concreted and paved a few times. This is the neighbours for comparison.
You’re right about the gas though, that’s something that I was wondering might crop up too.