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Wow! what a difference 12 hours makes! I can now see its clipped (thanks Baz).
I thnk that Greg is correct. I think its actually th tracking that caused the star curvature / elongation. I wasn't happy with the tracking from the start of the session really. I had to use star rounder to round them out - hence the slightly out of focus nebula.
The guide star was off centre too and I think thats why ther is curvature in disproportionate areas on the image rather than everywhere.
I put it down to my canon power pack swaying around a bit so next run I am going to make sure that everything is tied down so I don't get that much movement. I am also going to ensure I pick a star closer to the centre and slighlty brighter than the one I used on this image.
I am going to do a repo based on the comments here (including fixing the blue colour)
Thanks for the comments and what a hobby we have!
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