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Thanks for the feedback everyone.
After still more reading, and with the advice from you guys I think i'll go with 10 or so flat and bias frames, and around 20 dark frames. I can build up from there if need be.
Apparently flat frames can be taken of the twilight sky, just before dusk. Not a lot of time to capture the images but it apparently works very well (the professional astronomers use twilight/dusk flat frames).
Cheers,
Matt.
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