That's a nice selection Graham. You've been shooting quite the collection of objects lately - nice to see you really got the bug!
I noticed you have some slight star elongation towards the edges (And I'm nitpicking here - it's really a minor thing!). You might want to try ST's Lens module with a 'Curvature Linked' setting of around 140% to flatten your field again.
Again, really nice work - keep it up!
Cheers,