It would be useful to know where the mystery 'Plane' picture was taken (ie which school did the pilot qualify for his RAe 'ticket')
Without even trying - we have found Caudron G types built by at least 5 different flying schools/factories (and there are probably more)
The Hall School of Flying operated Caudron based types and also Avro 500's,the photo below has 4 caudron based aircraft and they are all different.
From the 'Windsock' Data File 94...
There was considerable inconsistency in both the shape of Caudron G.II and G.III Fuselage Nacelles and in the manner in which they were joined to the rest of the airframe.Some were rounded, some angular,some were suspended above the wings on the 4 cabane struts while others sat on or were faired on to the lower wing.
From 'Aeroplane' April 5th 1916
At the Ruffy-Baumann School the instruction is done by Swisspilots and therefore the difficulty has not arisen.
This firm, by the way, took over the old Caudron Works
at Old Hendon a month ago, and has already turned out three complete 50 Gnome Caudrons
Just to reinforce what PDR posted earlier - here is an extract from 'Aeroplane' April 26 1916.
Bournemouth Flying School...
The school equipment at present consists of three Caudron type biplanes, built by the London and
Provincial Aviation Co., of Hendon, and fitted respectively with 35, 45, and 60 h.p. Anzanis, the two latter
being dual-control two-seaters. A fourth Caudron-type machine has been built at Bournemouth under the
supervision of
- Mr. Samuel Summerfield, the school instructor, who has trained
local workmen. Every part has been made on the spot, and the workmanship appears quite excellent.
The assembling will probably be completed during the present week.