On April 10, 1998, the Good Friday Agreement was signed in Belfast, putting an end to three decades of bloodshed in Northern Ireland. Twenty years on, peace is a reality on the streets. But divisions remain and Belfast has been without a devolved government for the past 15 months. Meanwhile, Brexit has called the political stability of the 1998 deal into question. Our correspondents Herve Amoric and Steve O'Reilly report. A programme prepared by Patrick Lovett, Rebecca Martin and James Vasina.