They'd certainly get a bill, which they would have to explain to their health insurance, here in the US. The uninsured cost of a legitimate EMT call for me last year was about $700, of which I paid about $250 out of pocket. Current exchange rate about £375 for the full bill. If there were a government added penalty... perhaps legal charges that would go on their record, both at the school and with the police... Yeah, it doesn't have to be that way, but the people who care enough to change it don't have the political power to do it.