I think there are many places where some sort of agreement needs to be negotiated, the Lake District springs to mind (can't see our PM doing anything about that) and another area in my view is the Mont Blanc area. I can say this of course because I've already been there, done that, have the T-shirt and don't need to go back again. On the other hand with rising numbers of tourists going here there and everywhere it's (it's a huge worldwide industry) and the constant demands of so-called 'free trade' capitalism I can't see any progress being made anywhere.