Simon,
I used in-camera NR as well as mirror lockup. With bulb mode set, I just used the remote to start the exposure, and then again to stop it.
RB tells me he used a light application of NeatImage.
I'll post a raw (ie: unprocessed) shot next week so you can see the (lack of) noise in the image, and how much was visible with just a single exposure, thanks to the dark skies.
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