A tree in next door’s garden leans over into mine because my neighbour has trimmed all the branches on his side. Last year a similar tree owned by my other neighbour fell into my garden, and I don’t want the same thing happening. I can’t afford to prune the tree on my side: can I get him to do it?
Write to your neighbour reminding him of what happened to the other tree, and suggesting he cuts the branches on your side to prevent a similar incident. If the branches overhang your garden you are entitled to get workmen in to do the job and send him a bill if he doesn’t do it himself by the date you specify. However to begin with I’d just point out the problem and hope he has the sense to do something about it.