Thanks Doug.
Re containers: I wonder if we haven't a theme developing. Conoulty's chain oiler, the two that you comment on, and , if I'm not mistaken, even the top photo shows a container in the gap between the rear stays - possibly another chain oiler.
Re brakes: Generally over-rated and not of much interest to Australian riders.
Re OC forks: Of course, my mistake. I've even seen an illustration, no doubt from Douglas literature, that shows the "TT/OC engine". Perhaps the two models had more in common than just the fork.
So on to the last TT photo I have come across, and not a very good quality one at that. Luckily it shows Bill Conoulty on what is almost certainly the same bike on which we see him above. I'm not sure what the situation was with brakes at Maroubra. I believe they were not allowed at the Motordrome in Melbourne, but Maroubra was a larger track (taking cars, for example) so maybe brakes were allowed if not used. Perhaps this explains the reversed front wheel, maybe to remind the rider that the brake was not connected?
I have one other photo that may show TTs in Australia, but beyond that I need help. Does anyone have other photos? Based on the small number of photos, few Douglas TT Models made it out here. I wonder how many. I've encountered the remains of three engines (two 500s and a 350)...
Leon