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.
Lets hope they lock this one up for life.
92 seperate incidents of terroristic threats against a particular group - or even the ten that he admitted to - would have netted him 5-10 pre 9/11. I believe he'd be facing 5-10 years per incident now.
There are specific laws against telephone harrassment in the UK under whih he is likely being prosecuted, possibly with racial aggrevation on top.
Sounds like a nutcase to me though.