Hugh,
A mate of mine bought one of these three cars a couple of years after the "London-Sydney"...but I don't know which car.
I went with him to buy it ...from an apartment on the Punt Rd hill in Melbourne.
It had been stripped of the 'Roo bars etc. ( that's KANGAROO protection bars..for our U.S. friends. Hitting a big 6-foot 'Roo, at speed, in the dark, is no fun!)
It had been (badly) re-trimmed back to Street standard..with "normal" seats and re-painted light/lime green. It was well known as "Sweet-Pea" ..'cos of its colour.
You can imagine, the inner guards/fenders looked like they had been hit with a Ball-Pein hammer 'cos of the flying rocks etc.
A fast car never-the-less.
My mate lived on a farm at Bunyip-south (Gippsland) and I got to drive this car along the Longwarry-Drouin Rd... at speed ...on many occasions.
He owned it for many years until an old lady "T-boned" him at an intersection in (the then country town of) Drouin.
He retired the car.
I have heard rumour that it may have been ressurected and is still in Victoria?
I don't see this bloke much now..but I do get a christmas card.....so in good time I will ask if he still has or knows any "Identification" eg Chassis No. etc.. and will let you know.
Cheers
Bob