Found high quality versions of two known pictures of a Commer Q15 15-cwt and a Commer Q4 3-ton truck.
Make sure to check out Graham Newell's "Military Vehicle" album at
https://www.flickr.com/photos/625327...7630353233450/
Source:
https://flic.kr/p/WF5LMc and
https://flic.kr/p/HtcpsP