I know I saw it. We were heading for a walk tonight, we were out in Holywood and noticed bright green lights in the sky about 7.30. We stopped mesmerised for 15 or 20 minutes as the shapes morphed, twisted and disappeared. It really was a most impressive display.
I googled to see if it could be true and yes:
Newsflash 29/10/03 20:00: Aurora seen from Lancaster! Around 20:00 this evening, aurora was sighted from Lancaster. A broad band of green aurora could be seen to the north. Activity is currently very high and it seems likely that the display will get better. Unfortunately viewing conditions are not ideal due to cloud cover, but in areas with low enough light pollution, the aurora may be visible through gaps in the cloud.
So go and look to the North, and check Aurora Watch for more details, this seems like a once in a lifetime opportunity tonight.
Update
This picture is the closest to what I saw this evening.