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Silicone as a temporary bodge*.
Longer-term: strip back the render and see what's happening behind it. Cement** render shouldn't be letting water through, even if it's trapped against it, unless it's cracked / breached.
* So good for 10+ years, if you're anything like me...
** if it is cement
NotThamesWater-
I'm going to double check that patch dries out outside when not raining, if it's constantly wet then it must be something else, hopefully silicone solves it.
We also have another damp patch on the opposite wall which we think lines up with the neighbours chimney (interior wall), probably not capped properly/at all, as again it always gets worse when it rains.
apc
So, think I've found the culprit of our damp patch indoors..
The patch lines up perfectly with the position of the gas meter outside, after it rains it gets worse inside
I reckon the gas meter is trapping water behind it at the bottom, saturating the rendering and coming through inside.
Whats the solution here? Silicone the gap between the gas meter and the wall? I might bodge a water proof cover to stop rain going down the back of the gas meter to test, but I have a feeling water will naturally condense behind it too..