Great. Thanks for responding. 

What I hope to achieve is a shared understanding of what the correct access tag should be and to have the map reflect what’s on the ground in a way that is accurate and meaningful. In practical terms I believe the correct access tag value for these trails is ‘permissive’. That’s not to say that the landowner is giving explicit permission (they haven’t) but the implicit permission that is nevertheless being given is reflected in that value. So this would then accurately reflect the truth on the ground, in accordance with OSM guidelines. 