Hello Jos. Yes, thank you, it does help. As suggested by TomVrille I did get a look at the Sanger book owned by a friend but having the photo on the thread allows me to study it at my leisure.

Any ideas on what that is on top of the fuselage between the cabane struts? It's not in the other photo. Judging by the position of the valve stem access in the right wheel the aircraft has been moved between photos. Many useful details are visible in this photo too. Gotta get the Sanger book next month. I've already blown this month's budget on the Roden 1/32 Alb. D.III and Alex Revell's "British Single-Seat Fighter Squadrons" book. My thanks again to you both.
T-roy