Posted: 09/05/2015 at 19:02
If you and your neighbour have to employ a surveyor, I think you have to share the cost equally.
It is likely, if there is no definitive owner of the hedge, you and your neighbour both own it equally. That is the case with the walls between us and our neighbour. Your neighbour has no right to encroach by even 1 inch on your land.
Unfortunately you have no right to light. Your neighbour has no right to discharge water on to your land from down-pipes or gutters.
Do get hold of the planning department and voice your concerns. And speak to your neighbour if you can.