It's not Isil's returning terrorists we should worry about. It's those who are already here

Isil's loss of territory has not produced the surge in terrorist plots that was expected. Since the beginning of the year, the UK has faced five successful terrorist attacks – and yet, with the possible exception of the Manchester bombing, none have involved foreign fighters. Rather than the individuals who went off to fight in Syria and Iraq, the threat comes from individuals who are still at home.