Well after about 7 years on the road I finally got busted. I mentioned that I was under the impression that it was ok as long as you indicated (and I semi thought this might be true). He corrected me and said that it was considered 'overtaking on the left'. He wrote down the provision of the Road Rules but I'll find it later if anyone's interested. I also mentioned that I was under the impression that two vehicles could occupy one lane as cyclists do and bikers do when riding in convoy. He said that's ok, but there is another regulation that there must be at least 1.5m between each vehicle. At this stage the ticket book hadn't been taken out, so I didn't press the point that there are very few roads that allow cars to maintain a 1.5m distance between each other. In the end we got to chatting about the Yamahas they now use and the desperate need for police prosecutors (of which I'm highly interested in of course), I asked him if I would receive an infringement notice, and he said he'll take my details 'and think about it'. Pays to be mellow when dealing the the boys in blue I find usually.