So after a bit of tinkering with OSM, i came back to this path, and i realised that it probably is an alley, just a private one. And as Mex mentioned, should exist on the map. I've added a locked gate to the map at the T and I've changed the alley's access to private. Based on my survey and the aerial imagery, i believe this to be accurate so i'll close this note now. thanks for the help, Mex