Finally after cloud band moved seeing looked good with stars twinkle free and my star collimation looked very steady with arcs around Airy disc.
Mars had slight undulations but fine detail showed on screen for decent stretches of time. Another cloud band was developing so I only had an hour before the mackerel cloud appeared.
I got 6 sets in all seen in gif animation taken every 10 mins.
Astounding work John, you have certainly managed to produce a wonderful portrait of Mars, this definitely demonstrates your skill and determination in astrophotography - inspiring stuff!
To John, Dunk, Dennis, Phil and all those who post their photographs of Mars, Thank you very much for your fine work.
It is VERY helpful for me as a visual observer. Can't find a Mars 'photo of the day' on the WWW, so coming to Solar System Images on IIS helps me compare what I think / imagine I am seeing to the Real Thing.