The original description for
TQ3860 : Coal Tax Post was "West side of Feather Bed Lane ½ mile North of Fickleshole near Warlingham". I found that very confusing because that is the description for
Post Nail Number 182 which has disappeared - see
Croydon Corporation list under Featherbed Lane (they call it a "Boundary Marker" but I think they mean Coal Tax Post).
But the image is undoubtedly Nail Number 181
TQ3860 : Coal Tax Post. I suspect that Lorna van Zee looked at the
City of London's version of the list and copied the wrong description.