Make sure you check all the things meant to be done for compliance have actually been done, eg in my case no rear eye level light and child seat anchor points.
The other things that you might think they won't notice (but they will) are ball joints, wheel bearings and bushes in odd places, even bolts missing from dump pipe, exhaust flanges etc will be checked.
Check that your front demister works, washers and water in the washer bottle. 80kph written on the spare wheel, no tears or metal showing through the seats.
Apart from this everything else that is obvious like completely 100% stock motor fuel and turbo wise, induction mods like pod (if mounted) intercooler are fine but not turbos. All emissions gear needs to be in place as well.