Contributor(s): Professor Richard English, Martin Mansergh, Jonathan Powell, David Trimble | What are the lessons from the 30 years of the Troubles for modern counter-insurgency and counter-terrorism policy elsewhere, for peacemaking and for reconciliation? Leading experts debate how Britain's experience in Northern Ireland can help us address today's terrorism and conflict resolution challenges. Richard English is professor of politics and, from September 2011, director of the Centre for the Study of Terrorism and Political Violence at the University of St Andrews. Martin Mansergh is an Irish Fianna Fáil politician and historian. Jonathan Powell is former chief of staff to prime minister Tony Blair from 1997 to 2007 and member of the LSE IDEAS advisory board. David Trimble sits in the House of Lords as Conservative Peer and is Nobel Peace Laureate 1998 (jointly with John Hume) following the making of the Good Friday Agreement in 1998.