Not sure about contesting, but yes, there are designated areas of land which are 'right to roam'
The *really* daft bit is that I can see one from my office window. It's about 2 acres and is completely surrounded by land which is *not* designated as right to roam :-)
So, provided the walker is prepared to parachute in, and then get some sort of airlift out.... they will be sorted :-)