I don't think it will be too long now before ordinary police officers in the UK are equipped with stun guns and zapping students. At the moment only firearms officers confronted by an armed person are allowed to use a stun gun.
I've heard a trial is already in operation, I know a couple of police officers in London who have had training.
http://news.bbc.co.uk/1/hi/uk/6660283.stm
I find this quote from the BBC website above to be quite funny,
"It's not fair to compare us with US-style policing. You won't see people tasered for traffic offences. Officers will use it responsibly. At the moment they have a baton and CS gas."