On January 31, 2017, Policy Exchange, one of Britain’s leading public-policy think-tanks, invited Prof Nigel Biggar to deliver a lecture on some of the moral lessons to be learned from the recent history of British military interventions abroad. After Iraq, he asks, in what circumstances should Britain go to war? The lecture was followed by a Vote of Thanks from Lieutenant General Mark Carleton-Smith CBE, Deputy Chief of the Defence Staff (Military Strategy and Operations), on behalf of the Chief of the Defence Staff, Air Chief Marshal Sir Stuart Peach GBE KCB. The lecture was published jointly by Policy Exchange’s Britain in the World project and the McDonald Centre. A transcript of the lecture is available to read here and a recording is available to view here. A précis of the lecture was published in The Times the following day in “The Thunderer” and can be read here and an extract was published in the March 2017 edition of Standpoint Magazine, which is available to read here.