FAR-RIGHT extremists have adopted the tactics of Islamic jihadis by posting videos on the internet in which they threaten to behead British Muslims. The films show balaclava-clad white British men brandishing guns, knives and clubs, calling on all Muslims to leave Britain or be killed. One appears to be a soldier who has served in the Gulf. In one film, a man tells Muslims to "go home" or risk being burned alive. He threatens, "I'll cut your head off", and claims to have "comrades" across Britain who have "had enough". The videos were made after the arrests three weeks ago...