[Free to access upon setting up an account] It feels appropriate, a couple of months after the twentieth anniversary of 9/11, to pause and consider whether the world is more, or less, secure from terrorism than in the latter part of the previous century. We inhabit a world where traditional terrorist threats, which tended to be localised and focused on the destruction of property and killing servicemen, policemen and public figures, feel somewhat primitive. Our new world is populated by Jihadis and extremists who buy ‘one-way tickets’ on route to martyrdom and mass casualty events.