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As I say, it can get very complicated. If you/Stayer/whoever contact the Ramblers, they'll probably be able to voice a hunch as to what it may be here. Quite a lot of the time, old things like rights of way simply get forgotten, for instance. Obviously, there have been a lot of cases in which landowners wanted to sabotage access. It's impossible to tell without more information.
@Oliver Schick
I don't know what I'm looking at...
https://footpathmap.co.uk/map/?zoom=17&lng=0.17116&lat=51.66959
The lines don't show up here so maybe it is private. But then why is there a sign up?