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Adrian,
Blink 1 hour of images and check. If you are taking 5 min subs, the rotation is usually so small it is undetectable in a single image. Over 1 hour, you should be able to see it. You can also measure it in DeepSkyStacker.
Remember you will always get some amount of rotation eventually, selecting a good star just minimises the impact. The key is a make sure your polar alignment is good enough to get through one sub without too much rotation.
James
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