Hate preacher Anjem Choudary was last night singled out as the alleged leading source of British jihadism. Usman Khan, 28, is the 19th Islamist terrorist who has carried out an atrocity linked to Choudary. Research by the Counter Extremism Project revealed another 18 extremists with links to Choudary had carried out terror attacks. Another 50 have attempted an atrocity, while 19 have fought or attempted to fight abroad."