Thanks for the suggestion Andy. I think it's at an equilibrium at the moment, with the part of the path that's almost certainly a shared cycle path now being marked as such again, and other parts closer to the London City Island and Goodluck Hope estates tagged as pedestrian footways based on the knowledge of the local resident.

Without clearer signage or confirmation from the landowner/council (both sought, but nothing back yet), that's probably the best we can do for now. If anything more happens, I'll start up a thread on the forum.