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Britain is formally out of the European Union, but for how much longer will it be a United Kingdom? The Scottish National Party says Brexit reinforces the need for Scotland to forge an independent future inside the EU. But in the face of implacable opposition from Prime Minister Boris Johnson, how do they get there? Stephen Sackur interviews Ian Blackford, the SNP leader in the UK Parliament. For all their passion, are the Scottish nationalists lacking a viable strategy?