Just in case anyone is still following this thread.
I've learned a lot processing this image. It's by no means good, but there are a number of issues that I have been able to resolve or improve.
Removed colour fringe, but this bloated the affected stars. Stars are rounder and better defined, except for the seagulls. Background is improved. .jpeg really doesn't carry it off.
Included a clip before colour adjustment, showing better resolution of clusters of stars. So I think the scope is performing OK. Better focus, tracking and processing should produce reasonable images in the future.
Welcome the feedback. Thanks again for your help.
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