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Yes I am painfully aware of that. My approach was to dig down in the hope that the moat will be further away from the current damp. Not sure there's much logic in that given the leeching properties of the materials in question.
There's a chance I'll redo the front garden bit as it's not very pretty if I can cobble some money together and if so, aim to create an actual French drain to take water away, towards the street.
The previous owner was growing flowers in it FFS
It's not a french drain if there isn't a way for the water to run off i.e. a pipe at the bottom of the gravel to collect water. What you might have is a moat.