Cheers Dave. Did have a quick look at the 40K VDR, but they're not much help to be honest!
I think the Putilov Garford would work out as Front/Side Armour 9, Rear 8, with 3 VMGs and a 76mm (Med?) gun. Supposedly not a very fast machine, so probably give it a movement of 9"
I've also done a couple of Russo-Balt armoured cars, which I reckon will be Front/Side 8, Rear 7, 3 VMGs and Fast 12" Movement