Scotland last year showed how dramatic referendums can be. So what would an in-out vote on the EU be like? What would be the crucial strategies for a winning campaign? The stakes would be huge for the UK, and if those who want a vote get their way, this could happen within the next few years. Chris Bowlby talks to key potential players and observers about their fears and hopes, lessons drawn from Scotland, and campaign plans already being made behind the scenes.

Producer: Chris Bowlby.