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I see. But the dpc outside needs fixed obviously. As far as I can make out, it seems to be like this:

The rad might have leaked in the past. I dusted the pipes with talc, and rubbed with tissue. They are bone dry. I think its far more likely that damp is coming from the bridged dpc outside, then coming inside through the holes in the dpc where the flooring butts against the wall.

Removed the skirting, and found a second breach of the dpc. The new one corresponds with the batten beneath the worst mold mark in the centre of the area, and shown in my 2nd of my original post. Here's pictures of both breaches. How could I repair these?

KenGMac. I never even considered the possibility of a damaged drain being a factor, so thanks for that, I'll get some dye to go down the drain.

JohnD I monitored the water meter for 2 hours. The reading did not change by any visible portion of 0.01 cu meters

From taking some measurements, that damp patch near the rad is below the front edge of the top step by 18" to 2 foot.

Its about level with outside there, hard to tell exactly. I can take some measurements. Re topping up, I did some plumbing work not so long back and that needed some topping up later, but its not needed topping up for several months now. By NO, do you mean you cant get condensation from a...

Now I'm not so sure about the radiator being the cause. I just turned it on, and I can feel it's hot right to the top. If it were leaking, there would be a cold air pocket at the top? And I know I have never bled it in the 5 years since I moved in. It could just be the cold water in the pipe...

The green thing is on the cupboard floor. The meter is facing out from the back wall of the cupboard. The face of the meter can be rotated to any way up you want.

Hmm, I'm in UK, not the States This is a picture of our meter

Yes, but it can only be a very slight leak. Check overnight?

Now, its looking like the central heating! Removed the piles of bedding etc from the airing cupboard, and the paint has blistered up just below the rad inlet. This is the inside of the true outer wall, probably only a few inches undergound. Plaster crumbly, meter reads 18% compared to 10% just...

and

heres the pictures

Ive hacked away at the exposed dpc to see how they've done it. Seems like they put a membrane between the steps/raised paving, and the house wall. But ruined it by concreting 4 inches over the top of the overlap? I imagine that could be fixed by hacking out the 4" of concrete and laying a slot...

Got it. Yes, well we don't know how damp the outer wall is. Its pebbledashed on the outside, and the inside of the outer wall isnt accessable. Its a strange arrangement, with 3 ft deep airing cupboard between the inner and outer. At the point where the worst damp is, the corresponding outer wall...

Post #22? I cant see any post numbering? You can see from the overall picture the difference in height, from 0 to 7 ft.

I think I need to chop away that region near that bit of dpc to see better....Speak later

Adsy, I see your slot drain example. You think it's surface water causing the problem? What about the moisture in the ground under the paving that's above floor level, and right up against the wall? Can you tell from that picture of the visible dpc how its supposed to be along the side of the...

Were in Kendal, we get a lot of rain, I dont think the black marks on outside walls mean a lot.