Lets say they find him guilty, What's the most they could do to this guy?I know their laws are probably less strict than ours (ie. do they have executions?)
I'm no expert on British law, but here in the US he could be charged with a variety of offenses, from perpetrating a hate crime to using a telephone to harass and threaten. Last time I checked, threatening to rape, murder and blow up people was a crime.