Sorry, neighbour overhanging bush story (!), will be brief...
We moved in to our house (quite rural) nearly 2 years ago about the same time as our neighbours. We both had to do a lot to gardens etc as both sides were quite unkempt. They've done a lot of very serious work and we haven't said a word about the constant chain sawing or the fact that they completely blocked our road (for about 40 mins) at no notice to remove rubbish from their garden and were quite rude to people trying to get past. We've also been accommodating if they've wanted to pop over to our side to do stuff more easily...
However they have huge (talking 3-4m high) cherry laurel bushes that overhang our garden/decking. It's so intrusive it's grown over an old shed roof causing more damage/preventing us from fixing it and it's berries are just about to drop all over our decking (which will stain it and is where our 19mo DD plays). I mentioned it a year and a half ago and was told they were dealing with it in spring 2012, our other neighbour mentioned it and they shut her down, I've left an answerphone message asking them over for a cuppa to have a chat about it and have been ignored. What next? I should add that the guy has just starte his own business as a landscape gardener so it's not as if he can't deal with it....