False Alarm. After ringing 5 Triumph Stores and searching the internet for aftermarket cables, the next store I rang was a Triumph Dealer in Melbourne who had an OEM clutch cable in their warehouse.
So I should have the cable by Friday.

I would have preferred the time to find a nice black aftermarket cable but I'm just happy to have found one anyway.
I'm still curious how it is possible the Australian Triumph Warehouse didn't even stock a clutch cable. In saying that, now I have to find out what the warranty is for the braided clutch cable I bought from Sel-Motion as it's less than 12 months old. Does anyone here know???
Anyway, the main thing is my now being able to ride up to Sydney next week

staffo