The UK voted to leave the European Union in June 2016. More than two years on, it’s still not clear how that will happen, or what will come after. Consensus within Westminster seems impossible, and if the deal currently on offer from Brussels is voted down on December 11, the UK could crash out of the EU with no deal at all. What makes it so hard to come up with a solution? The BBC has followed all of the twists and turns of the Brexit negotiations in minute detail. In this special programme, four correspondents from across the organisation give their take on what makes Brexit such a fraught process. Katya Adler, Europe Editor Chris Morris, Reality Check Correspondent Alex Forsyth, Political Correspondent John Campbell, Northern Ireland Business and Economics Correspondent Presenter: Edward Stourton Producer: Lucy Proctor (Brexit Map - Getty Creative)