Thanks. All very rushed, because: (a) I really had no idea what the camera (G12) was capable of; (b) it was clouding over; and (c) I wanted to get back to our holiday digs to alert Dr RJ ...
So, I have a couple of shots at f5.0, which don't seem to me to show anything like the same amount of detail. But I didn't really bracket - largely because 15" and f2.8 are as slow and wide open as the camera will go.
I was quite pleased, as it was a very dim display.
Anyhow - no that I know that the camera will cope, I'll keep an eye on the various aurora forecasts, and keep my fingers crossed the next display visible from Edinburgh isn't on a Thursday ...