Britain starts the formal process of leaving the EU this month, giving impetus to calls for a fresh vote on Scottish independence. Dan brings together the BBC's political correspondent Rob Watson, Professor John Curtice of Strathclyde University in Glasgow, and Britain Taylor, political editor for BBC Scotland. (Photo: Scottish voters in favour of independence on the first anniversary of Scotland's 2014 independence referendum, in which 55 percent of voters were against leaving the United Kingdom, 19 September 2015. Credit: Andy Buchanan/AFP/Getty Images)