At some point the front prop had been removed and I was pondering why...
I had assumed that the 4wd system would be the same as that used on the Black Cab with the front propshaft running from the drive on left side of the rear axle as shown in the brochure:
But no, there is a transfer box on the right side of the 4 speed gear box with a much shorter prop going to the front axle:
This makes me ponder whether there it's something that could be retrofitted (gearbox being a hell of a lot easier to swap out than a rear axle)...
It does seem curious that there were two different 4wd systems used in such a relatively short period of time.
