AA
My understanding is that they are informal and not mentioned in either Pooleys or the CAA publications. So of little comfort to anyone new to the airfield (however if used they do increase the safety factor a little hence my posting them here). I'm not sure but I think the current litigation environment has caused some operators of unlicenced fields (or limited time licenced - as in this case) to have as few published procedures as possible so as to reduce the legal risk where the procedure causes some sort of incident.
One example I can think of at this airfield is that the 'taxiway' from the 'C' hold which avoids back tracking is also the public access to the club house. You might avoid being hit by 50ft circuit traffic but collide with a car!.