According to motoring journalists in very close contacts to James May, Jeremy Clarkson was fired because he had paid not enough attention to Tatra, the BBC’s direction favourite brand. After the BBC ordered Clarkson to pay more attention to the Czech brand, Clarkson got furious, and shouted at a colleague and gave him a few blows. According to the BBC, Clarkson crossed a line. Tatra lovers should not worry however as known Tatra fan Stephen Fry revs up as Clarkson’s successor.
http://www.dailymail.co.uk/news/article-3001616/Fry-revs-replace-Clarkson.html