Ah, well I found out about the Twin Otters:
DeHavilland DHC-6-100: VH-TGR, VH-TGS, VH-TGT, VH-TGU.
DeHavilland DHC-6-200: VH-TGV, VH-TGW, VH-TGX, VH-TGY.
DeHavilland DHC-6-300: VH-TGE, VH-TGF, VH-TGG, VH-TGH, VH-TGI.
But what about the others?
Also, was the Catalina VH-SBV the only one or were there a few? Was that the one Garth Roche went swimming with?