Not sure whether to change this topic to uncompleted, so I have and hope that's the right thing to do.
I have just discovered John Campbell on the WW2 ballot list for NZ published Dec 1942. I'm pretty sure it's him as he's in Taipuha, and listed as a steam shovel driver. Having found out what a steam shovel is, I would think that would qualify him to drive a shunting train too.
I looked up the NZ service records and they are coy about charges. Anyone can ask for the service record of someone who's died, but they don't say what the cost would be to provide a copy of the record (if they had one). Does anyone know what the ball park figure is for such a thing? Not for medals, just for the service record.