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  • Not Concrete! At a guess, the house looks about 1870ish. That means that it should just be earth/crushed stone mix in the cellar, though I can't see from the pictures. Concrete poured into the cellar beneath a house on London clay isn't always the best idea, despite it being a popular move during the 60s and 70s, as it creates problems with condensation and damp. If there is a slight slope to the site, there may also have been a small drain to remove water, which you should look for before you do more drastic work. Wooden floor recommended slightly suspended above the earth floor, (if it isn't concrete already).

    Great project - can't wait to see more pictures.

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