Thanks guys.
It was one of those nights that just evolved without a plan. It was such a brilliant day yesterday I had to get the scope out. Then I realised the moon was up, so I thought I'd just set up in the front yard and image that and then maybe Jupiter. While drift aligning in AZ on the moon I thought the seeing looked good so I stuck the camera in to start capturing... I never finished drift aligning, or even check collimation!
My max min thermometer tells it got down to -5 deg C last night. I believe it!
Al.