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It would cost you a bag (or tub) of cement, some sand, and a few hours’ work over two days. You won’t make things any worse. It already looks terrible. If your neighbour is arsey about it just do it to the halfway point.
Sharkstar-
You are assuming I can do a half decent job rendering it which is far from certain. Sand and cement render has cracked and fallen off at least once before, only a few years after being done professionally, so I assume I would also need some sort of additive to help it stick and keep moisture out. And a mixing attachment for my drill, and a plasterers float and possibly some other tools? So it wouldn't end up being super cheap. The only thing that worked on the nearby retaining wall was a multiple coat K rend system with a mesh as well. Which is definitely beyond my abilities...
It looks terrible at the moment but that's partly because it's covered in sand and bits of broken render. Hence wondering if a bit of smoothing it out and limewash or something like that would be a viable improvement.
I would enjoy the pettiness of doing it to the halfway point but I generally get on reasonably ok with the neighbour so am hoping to meet her somewhere in the middle.
lemonade
Thanks. Well, sand or wire brush off the remaining loose render/bits of sand and cement, rather than the brickwork itself. It's very porous so I'm worried about too much moisture getting in if I just leave it.
It's not just the cost of getting it rendered, I would of course need the neighbour's permission to do her side. And I reckon she'd say no even if I offered to pay for it all, she's not the type to get anything done.