This is the first time I have imaged after cleaning my primary and secondary mirror which has had quite a positive effect on image brightness last night. It took a while for the seeing to steady and by that time the secondary mirror had started to frost up, which is ashame as sirius looked very steady.
As a side note I was wondering if anybody was observing or imaging at about 21:48 UT last night (17th Novemeber) as I think I glimpsed a flash/bubbling confined to a small area above Jupiter's surface lasting about 0.5-1 sec. It reminded me of Io moving across the disc in poor seeing. Unfortunately I was not recording at the time. It was probably nothing but I would be interested to know if anybody else saw it.