BRITAIN has resorted to detaining as an illegal immigrant a man regarded as one of al-Qaeda’s most dangerous terrorists. Abu Doha, whose various aliases include “The Doctor”, has been in Belmarsh highsecurity jail for almost six years facing extradition to the United States on charges of running a jihad training camp in Afghanistan and plotting to blow up Los Angeles airport. But the US has been forced to drop the case against him after an informer refused to give evidence. A British judge described the extremist network created by Abu Doha as “one of the most significant groups of terrorists...