I have received a private message from Mike Jenvey. I have explained that the best photograph (of three) is taken from above and clearly shows the 10 aircraft in a quite presentable vic 3/vic 3/box 4 formation.
The trouble is that the photograph is far too big for my A4 scanner to deal with! (The photograph is approximately A3 size).
Anyway, I shall work on the problem with Mike and we shall see if a solution can be found.