Thanks for the comments folks!
Jeff-pretty easy to re-do a slower version, so
I added the link here! Bit more lumpy when you slow it down as you can see I did a few captures in quick succession in the 5min when the seeing was spectacular and then about one every 5min after that. Darn meridian flip in the middle of it too!!
Thanks Anth- yeah that's the best one I got of the GRS this year. I was a bit torn as I really wanted to chuck the binos on as well so did that just after I finished the captures I uploaded here!
Cheers Marc- a couple of your hints about the AS!3 processing parameters helped speed up the processing a bit actually. My poor 10yr old Microsoft Surface almost had smoke coming out of it...