I had precisely this problem. When I asked my neighbour (whose trees they were), the reply was: "Grow up, get a life!".
I took a chain saw on a pole and started cutting off the overhanging branches and depositing them on their front lawn - one branch took two of us to carry it.
Their son (a gardener) promptly turned up and offered to remove the offending foliage.
Branches overhanging your property can legally be removed and although you can ask your neighbour to deal with the problem, they're legally responsible for the timber and you have to return it to them. It's a moot point if you can charge them for the cost!
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Offensive conifers 
Offensive conifers 