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EDINBURGH, SCOTLAND - NOVEMBER 27: Deputy First Minister John Sweeney (L) and Annabel Goldie, with Lord Smith of Kelvin, Chair of Commission holding the Smith Commission report at The National Museum in Edinburgh, as he launches the Heads of Agreement, which have been drawn up by the Smith Commission looking at further devolution for Holyrood on November 27, 2014 in Edinburgh, Scotland. Lord Smith, announced that the Scottish Parliament should have the power to set income tax rates and bands, he also said that a share of VAT should be distributed to parliament and air passenger duty fully devolved. (Photo by Andrew Milligan - WPA Pool/Getty Images)

EDINBURGH, SCOTLAND - NOVEMBER 27:  Deputy First Minister John Sweeney (L) and Annabel Goldie, with Lord Smith of Kelvin, Chair of Commission holding the Smith Commission report at The National Museum in Edinburgh, as he launches the Heads of Agreement, which have been drawn up by the Smith Commission looking at further devolution for Holyrood on November 27, 2014 in Edinburgh, Scotland.  Lord Smith, announced that the Scottish Parliament should have the power to set income tax rates and bands, he also said that a share of VAT should be distributed to parliament and air passenger duty fully devolved.  (Photo by Andrew Milligan - WPA Pool/Getty Images)