As EU leaders meet in Brussels to discuss moving on to the next stage of Brexit talks, we focus on the thorny issue of the UK's border with Ireland. Despite last week's breakthrough deal to ensure the frontier remains "soft", the issue is expected to resurface since eventually, this should become the only land border between the UK and the EU - with huge implications for trade. Our correspondents report.
A programme prepared by Patrick Lovett.
Professor of British civilisation, University of Caen