Hornet, feel free to go around the obstruction as Womble suggests, you have every right to do so. No need to feel "naughty"
Also, I'm not suggesting that this issue get left alone by the way, I will be pushing NCC to get the obstruction removed I just think it's better to get it done through the authority than do it ourselves because we could find ourselves in a battle with the landowner.
I've seen this sort of thing happen before. We remove bails, he erects fence, we remove fence, he parks large piece of agricultural equipment etc, etc you know how it goes, round and round and round just causing agro.
As I said before, watch this space but I think ultimately this might need to be resolved by a legal diversion order rather than the permissive agreement which obviously hasn't worked. In that case keeping th elandowner on side will be vital to getting a result that benefits us.
Cheers
Richard