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Had a look and it's hard to tell. There are some triangular shaped jobbas over the top which I'd assume are cowls but whether there are caps as well I can't really tell.
@Brommers I suspect those are both possibilities as well. I was thinking the capping was more likely as the damp appears to start at ground level whereas if it was leaking through I'd expect to see damp upstairs too.
Need to try and work out the easiest way to find out.
Talking of roofs and chimneys, this spell of rain has caused damp patches to appear on the chimney breast in my kitchen.
My first guess was that the chimney hasn't been capped properly and rain is getting in. Does this sound like a realistic possibility? If so, how to fix it?