Am I responsible legally or morally for my neighbours water damage?

[GenDisharmo]

This is concerning a terraced victorian property. I had the old render ripped off exposing cob and slate before coating nearly the whole area in new lime render at the front of the house, and the joint in question is on the right of my house and to the left of hers. I didn't render the sloped bit ( door canopy?/lintel?) above my front door or the extruding plinths to the side of it and they are still presumably in cement.

Work was done last summer and in October I noticed that the side of the canopy was deteriorating so I had it filled.
In the past couple weeks both the neighbour and I have had mild water ingress along the party wall. There is a crack along most of the the joint between my old unrendered part and their render. There are now more cracks in the canopy, I'm not sure (and doubt it can proved) which cracks caused which, but water is likely coming through the boundary cracks and canopy cracks both. I incorrectly painted the sloped part of the canopy which is old render btw.

Is this just wear and tear and a joint responsibility to repair the shared crack? What about who pays for the internal water damage? I have done everything I can to repair my house when I first find any damage, the neighbour is blaming me and the renderers (which it seems have nothing to do with it as their new section is fine) and threatening to take me to court.

Also a surveyor was mentioning that I should have got a party wall agreement which I think is nonsense.
Thankyou.

https://postimg.cc/hQLRZB1d
https://i.postimg.cc/g23czWGH/IMG-20...51416-Copy.jpg

[atticus]

It is possible that you are liable. You may do well to speak to your insurers.

Try to get this resolved before it gets very much worse.

[GenDisharmo]

It is possible that you are liable. You may do well to speak to your insurers.

Try to get this resolved before it gets very much worse.

Im getting the crack repaired asap and paiyng it myself even though I think due to it being on our boundary that surely we are jointly responsible. I think morally that means im even for the neighbour paying a useless damp surveyor. Yeah I pased their damp surveyor report to my insurer. they said its useless it doesnt show any proof of it being my fault. the surveyor outright lied when I met both of them, none of his verbal diarrhoea were in his extremely sparse written report.

the insurance company is just considering it wear and tear which is most likely.

[GenDisharmo]

I am new to insurance so please forgive any ignorance. if a washing machine leaks in my property and causes a lot of damage to the neighbours, im only liable if I knowingly use a damaged washing machine for example, it seems i have to have been negligent right?

How have I have been remotely negligent here?