After months of posturing and prevaricating the Brexit endgame is underway. This is the week the UK Government and the EU 27 earmarked for agreeing a deal on the divorce and outlining a future close relationship. But on the eve of another EU summit, there is still talk of an impasse--focusing on the Irish border and Northern Ireland's status post-Brexit. HARDtalk's Stephen Sackur speaks to Mairead McGuinness, Irish MEP and vice president of the European parliament. Is Brexit about to get very messy and very costly? Show less