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any idea what's causing the leak?
i.e. is it something simple that you could fix for your own piece of mind?
bigshape-
It's likely some damage above and to the outside. The steps you see in that pic are into a sort of mini extension added in the 50s. Above it is decking on both sides (neighbours and mine). They did some work a few years before we moved in and previous owner said wall issues started around then. Suspect it's minor but previous owner was adamant he wasn't going to do anything as 'just the nature of old buildings'.
Then he died and it's been in limbo (inquest etc). Apparently it's now for sale so hoping new owner will give more of a shit, but if it's another BTL schmuck, like the guy who's just bought the house on the other side and immediately let it out to someone who screams 20 hours a day, I won't be holding my breath.
CYOA
I worried that (that it would be 'best'). Just don't know how to approach with a neighbour who isn't sorting out the source of the damp. We've had our walls stripped back to stone and covered with waterproof boards, then plastered over, but we're still getting a tiny patch (5-10cm) in a corner so I'd hate to have it peel up.