Posted: 05/03/2017 at 15:27
It seems to me that the builders have been taking liberties and should, at the very least, have asked before using your driveway for parking or dumping materials. Maybe a quiet word to that effect and then ask them to clear up their mess and park on your neighbour's side.
I would also have a gentle word with your neighbour about local regulations for fence heights. If the planning office doesn't like what he's done they can make him remove or modify it.
Do try and solve it amicably if you can because neighbour disputes can make life very unpleasant and ca also go on for years if one side decides to be unreasonable or vengeful.
When we bought and sold our 30s house in Harrow it was very clear both in the deeds and from solicitors and estate agents that the "business" side of a fence is on the owners' side so they have access to support posts etc for any repairs needed. The finished side faces the neighbours.
You should seek permission to go on the neighbour's land to do any repairs from their side. Neighbours, in turn, should always seek permission before adding any features such as trellis, support wires and so on for their own plants.