Rob,
try ISO 800 or 1600 and exposures of 25 secs or 30secs. Set fstop to lowest number poss (around 4.3 or so)
Focus can be a bugger (as I found recently after taking 200 shots!)
One exposure of that length should give you some MW detail (some photoshop work will help lift subtle details) and if you take many you can stitch into a startrail.
cheers
niko
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