The sky was clear so I decided to have another play tonight. As I suspected, AV mode is not usable for the purpose. I thought from testing in the house it would top out at about 1/3 of a second exposure which was not right, it went longer than that but pegged at 2.5 seconds.
I will have to have a try with my wife's D3 and see how it behaves, though I am not allowed to leave that out all night before I find a weatherproof enclosure for it. At least I could let it run in the dusk and see if it keeps on going to a decent exposure time.
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