The rotten fence is only just holding together, and won't be there on after mines finished.Neither of you will be able to get to the back side of your fence to paint or whatever you finish it with.
I screwed it back together temporarily (to keep next-doors yapping mutt in) to enable me to have time to build my new one.
It's also tanalised timber, and I've slathered it in Creocote during assembly, & am capping it.... so it might see me out (& it's a racing cert it'll see the neighbour out) - then hopefully any new neighbour will be half-decent.