A UK judge on Monday jailed notorious far-right agitator and self-professed anti-Islam activist Tommy Robinson for 18 months after he admitted committing contempt of court over a long-running libel case involving a Syrian refugee. The sentence is the latest jail term for one of Britain’s most prominent anti-Muslim activists, who is blamed for helping fuel anti-immigration riots earlier this year. It came after Robinson – whose real name is Stephen Yaxley-Lennon – pleaded guilty earlier on Monday to 10 breaches of a 2021 High Court order. It bars the 41-year-old far-right figurehead from repeat…