In September 2014, the Scottish people will be presented with a referendum on Independence. But what do Scottish Nationalists believe and how has the argument developed over Scotland's History? Professor Murray Pittock of Glasgow University, author of "The Road to Independence" (2014) explores the growth of Scottish Nationalism from Scotland's prehistory, through Union with England, the Scots contribution to the British Empire, and the Salmond Government of today. Scottish Nationalism is the force which may end the Union with England and propel an independent Scottish state on to the world stage. Here is the story of how it has grown over the centuries.