Have you seen the photographs on the BBC?
http://www.bbc.co.uk/news/uk-26378027 It must have been amazing. Sadly I only found my Aurora Watch email this morning, and then again they only gave an Amber Alert! I suppose the problem is that you can never be sure even if you stay up all night and also that every good alert here seems to have come in cloudy conditions. You can sign up on the Aurora Watch website. I've met the people at Lancaster University who run it. Try Googling it.