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Thanks mate, appreciate it :-)
I don't think this is drift. The stars have an unusual shape rather than simple streaking, and while the center of the image is fine, it gets progressively worse the closer to the edge (the supplied image being the the top right hand corner of a recent image).
I'd not noticed it before last night, but I'm not sure what it is. I'll have a look through individual frames and see how they look because I've only looked at the stacked result so far.
Thanks again!
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