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.