Just opening up this post again.
A bit of searching at Dhadnah has revealed some possible sites for the grave I mentioned above. It would be great if I could find if any of the surviving 1943 crew are still around:
Sgt. G. Chadwick (pilot); Sgt. G.A. Wharton (wireless operator); Sgt. W.J. Brown (wireless operator); Lt.-Col. De Watteville (passenger).
What was the passenger doing on board that flight?
Laurence