Update on the extinguisher guy:
Telegraph (yes, I know) reports that he's a 17 year old from Hampshire who's now out on bail. Looking at the picture, he doesn't look like the same one from the well-circulated photo. The good news is that his charge has been downgraded to violent disorder. He also entered no plea in court.
Welsh Sec abandons visit to Abersywyth (sp?) Uni due to planned student protests: http://www.bbc.co.uk/news/uk-wales-mid-wales-11780225