The photo shows Crossley IGL trucks. The one on the far left differs in many details: spare wheel mount, rear view mirrors, radiator mask, position of parking lights, etc. According to
http://www.crossley-motors.org.uk/hi...IGL3/IGL3.html there were six
Crossley IGL models - from the third to the eighth.
IGL 6,7 and
8 - forward control,
IGL 5 - experimental model. What models are shown in the photo? The one on the far left is
IGL 3. And the other two cars?
IGL 4?