What Ochico was too modest to mention was that they can provide a rucksack badge and certificate for anyone who does this great walk (for a modest fee, of course 😆 ). I did it last year. Took me two and a half days with two nights wild camping. It was great fun and I recommend it to anyone.
I think placing a series of caches round this ancient boundary, in a kind of trail, is a great idea! 😆