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No improvement after digging the trench?
FWIW I suspect the ground...at least in London...is still very wet after the crazy rain we had.
We were having our roof done and we went a week or two with no effective guttering which dumped countless litres of water around the front of our gaff... we've had a musty smell from the subfloor since that has only just started to go away over the last couple of very warm days and about a week of running a dehumidifier on full blast.