Yes, they're all Ariel WNG models, the photo is one of30 odd photos, one has a Nottingham photographers stamp on the back, the guy fourth from left with the glasses and white instructors helmet features on a few, will show a few more if anyone is interested.
The more the merrier Steve. You can often glean some details from original pictures.
This is Royal Corps of Signals instructor J Stratfull on a C10 in 1939. Ron
The rider of this motor cycle features quite often on some of the photos,here probably earlier in the war ,with home made black out shield ??
Below,another one with the home made black out shield?
Below,same guy as above but from the 43/44 training photos at far right.