Summary: Abu Bakr al-Baghdadi is dead. In this week’s Sitrep, we examine the implications of the death of the IS leader, with Fawaz Gerges and Professor Michael Clarke, former director-general of the Royal United Services Institute. Britain is set for a pre-Christmas election. The Times' political Correspondent, Lucy Fisher, looks at whether defence issues and a former Army officer explains how he helped track down one of the suspects in the Sergei Skripal poisoning
