Brexit and Ireland: What's at stake?

What is at stake for Northern Ireland and the Irish Republic in terms of security, the economy and the politics, as Britain prepares to leave the EU. David Aaronovitch and guests discuss. GUESTSPeter Taylor - BBC journalist who has covered Northern Ireland for nearly five decades. John Campbell - BBC Northern Ireland’s Economics & Business Editor Dr Katy Hayward - Political Sociologist at Queen's University, Belfast Dr Margaret O'Callaghan - Political Analyst at Queen's University, Belfast Dr Etain Tannam - Expert in Irish diplomacy and cross-border co-operation, Trinity College, Dublin