Is this rising damp?

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Time for some investigating. Have a dig into that render, see what's behind it.

But also, as stated earlier have a walk outside in the rain and see what's happening with the drains and downpipes. The weather's currently perfect for seeing exactly what's going on.

The internet's not going to tell you, all we can do is point in possible directions. You need to take it from here.
 
No blockage on the downpipe drain. No overflow. I haven't got the faintest idea how to remove the render or how much of it
 
The DPC will be two bricks above where ground level used to be when the house was built. The doorstep about the same. You can often see the DPC under or beside the doorstep. Once you find it, it is pretty sure to be at the same height all round the house. Have a look at neighbouring houses that have not spent 90 years raising the level of gardens, drives and paving.

Scrape away the earth round your airbricks and you might see it. Photos of the airbricks and the wall around them may be informative.

Have you shown photos of the gullies your rainwater downpipes run into?

The trough is not a drain, but it might run into one.
 
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The downpipe that leads to the drain is totally clear and is now covered. There was no issues though with that overflowing
 
The downpipe that leads to the drain is totally clear and is now covered. There was no issues though with that overflowing
I haven't seen the actual drain in your photos.

Houses of that age have gullies and drains made of brown glazed clay (like a teapot).

IME they are always cracked or broken and leaking in the ground, but I have heard that some aren't.

Would you like to show us yours? Scrape away the earth round it, or show us the surrounding concrete.
 
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This is what the surround looks like without the cover. Taken a few months ago with mostly cleared of leaves etc
 
How far is the grille below current ground level?

If you pull the metal grille out, is the gulley itself brown glazed pottery? Is it full of mud and grit? Can you see a crack?
 
You need to look at that drain while it's been raining heavily. They often get blocked and the water ends up going out of a crack into the surrounding soil, waterlogging it.

But this alone wouldn't cause a damp wall, but the fact that your DPC is bridged by render would allow it up into the wall.

Also check whether the cavity is full of rubbish.
 

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