On close examination, this rather uninteresting photograph taken by Middlebrook appears to show an earthwork or sangar behind the main British trench.
The rubble in the foreground suggests that this was taken in front of the newly erected main memorial, and the orientation of the I.L.I. monument in the left distance seems to confirm this (see below).
Assuming Middlebrook used a lens with a c. 50-degree angle of view, the photograph depicts an area of ground that is now featureless. However, in the middle distance on the right, extending across about one third of the picture, what appears to be an earthwork is just discernible. The approximate location of this feature is marked in green on the aerial photograph below.
"The Exposed Top (No 2) - Battle ground of Spion Kop where the T.M.I., I.L.I., Lanc. Fusiliers and Middlesex Regt suffered so severely - Jan 24th 1900" (Photographed by Middlebrook, Durban).
What appears to be an earthwork or sangar can be seen in the middle distance on the right. The lower image is a close-up of the western end of this feature (about half of what is visible in the photograph).
These two images show the different viewing angles of the I.L.I. Monument. The first is a photograph taken from the northern end of the eastern arm of the main British trench, where the memorial is seen face on. The second is a close-up of the Middlebrook photograph. The angle of view indicates that this was taken from a position roughly 22.5 degrees to the west of the first image. This places the photographer on a line that passes directly through the main Spion Kop memorial (see below).
Image from Google Maps, showing the approximate position of the photographer, the angle of view (in red) and the location of the earthwork (in green).
..