Steve, the Norton is from a mid - late 1942 contract and by that time the British Army don't seem to have been taking many Nortons but the Canadians still were and most photos from this contract show Canadian units.
I wonder if this could be a Canadian Signals or Provost team ?
Another photo of the unknown wartime display team.To simonofsweden I asked someone about capitals it seems you are right,lets see if an old dog can learn new tricks.