Well technically it's not really back because it never went away.
Thought I'd try to bag it again tonight. Mounted the camera on the StarTracker and started snapping away. Unfortunately I only managed to get 9 x 64 sec images before thin cloud rolled in and parked itself just where the comet was.
Anyway, here is the stack of those 9 images. The comet is the faint fuzzy greenish blob just up and to the left of centre.