Thanks for all the Replies
Hi astro744 , mental4astro, multiweb
Thank you for all your suggestions, I had an idea but having never really used a SCT before wasn't sure.
The spot seems very central so looks like Collimation is pretty good.
I hadn't thought about the Pupil dilation at night but that would have a large effect.
I certainly have light pollution , a Bortle 6 according to the Clear Skies App.
Cheers
Cliff
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