Searching for a Plan B

In the run-up to the French and Dutch referenda on the European Constitution, EU leaders were adamant that there was no Plan B.

Now that voters in both countries have rejected the treaty, and the UK is putting its ratification process on ice, it seems that Plan B is needed after all. So what options do heads of state and government have as they prepare to meet in Brussels on 16-17 June?

The strategy chosen after previous European treaties were defeated in referenda in Denmark and...