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Someone probably knows more than me but I think the DPC is likely to be directly above the air brick so the mossy brick is below the DPC and not a problem as such. The patio also appears to be below the DPC. I'd be looking for other problems.
jellybaby-
Hmmm OK thanks for the heads up. The hunt continues then I guess. Roof looks fine but I'll have to have a closer look...based on my very limited clues if anyone has any further suggestions then please do share!
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I think the DPC is likely to be directly above the air brick so the mossy brick is below the DPC and not a problem as such
That's what I was thinking too (not that I know more by any stretch - I just spend my time trying to fix damp problems).
What does the door frame look like on the side that has the damp?
If that's damp around the light switch, it suggests that water is running down the wire from somewhere - which means that it's possible travelling along a joist from somewhere else.
Quincy
NotThamesWater
If your house looked like this, what would you do?
Internal wall - damp
External wall - mossy at the bottom
Patio - does it have to come up or is there a less destructive option? Should there be some kind of french drain/gravel trap here?