Thanks guys. It is a LEMO connector (I had never heard of them before now); but I should be able to buy off the shelf at a last resort thanks to all your info.
I have a couple of Green Trade mates here in Oz who reckon that if I source the plugs, they can splice the dongle. I'll see if I can source the plugs now...
Thanks heaps for all your help. Hope the info helps others too
Cheers