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NotThamesWater
I might be wrong about it being under a supporting wall but there are definetely bricks sitting above it on part of its length.
There is quite a gap from the air brick to to the joist and it sits above the DPS but as Bobbo mentioned over the years there has been a build up of dirt etc meaning that when there is heavy rain it can run down and drip over that particular joist. Hard to explain without photos.