Just started reading Kristen Alexander's book Australia's few and the Battle of Britain, the general concensus is that 31 or 32 Australians served in the BOB, a lot of them were trained in Aust. then dischrged from the RAAF, shipped to the UK and joined the RAF Even though some were born in Aust. their passports designated them British subjects and were listed as British on their service records. As for decals DK have some on their sheets if you can find them, try Red Roo. PD Decals had some years ago, Metro Hobbies, Box Hill had heaps not that long ago, and the Aeromaster BOB sheets would be easy enough to convert.