A “Yes” campaign placard is fixed to the side of a cottage on the Isle of Lewis, in the Outer Hebrides of Scotland

A “Yes” campaign placard is fixed to the side of a cottage on the Isle of Lewis, in the Outer Hebrides of Scotland

A “Yes” campaign placard is fixed to the side of a cottage on the Isle of Lewis, in the Outer Hebrides of Scotland September 15, 2014. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Cathal McNaughton (BRITAIN – Tags: POLITICS ELECTIONS ENVIRONMENT)