How Britain could leave the EU

Britain's departure from the EU grows ever more likely. David Cameron, the Prime Minister, wants Britain to stay in. But he seems set on a path that could lead to an exit. British withdrawal requires two conditions to be satisfied. First, the government of the day must call a referendum on whether to leave the EU. Second, a majority of voters must want to quit. The first condition seems likely to be met, and the second is, for now, fulfilled.

• Primary Source