In reply to Saor Alba: I don't think it has, I'm just disagreeing. I think you are projecting a Scottish issue onto England and Wales. Vast swathes, as I understand, of Scotland are owned by absent land lords, and it's land not being used.
In the rest of the UK we don't have such a great issue as far as I know.
There are some estates but not the same extent.
As Tony says I think including any debate will get landowners backs up and kill this in an instant. Coastal access is a huge issue still, same with rivers. I think we can make gains there.