As you say the whole area is a mess. I explored it and mapped some of the paths from local GPS survey. The paths that I have marked Barnet FP 03, 04, 05 and 06 are the only public rights of way. Barnet FP 04 is overgrown and impassable and is obstructed by a fence at the junction with FP 03 and FP 06. Barnet FP 05 has broken footbridge. Ramblers are aware of this.