"It was the focal point of the original plan, " says Charles Beveridge, who has edited Olmsted's papers for 30 years.

WSJ: In Brooklyn, G Marks the Spot

The Fiscal Commission Working Group (FCWG), chaired by former Scottish Enterprise chief Crawford Beveridge, was asked by ministers to plan for how Scotland would become independent, if there is a "yes" vote in the 2014 referendum.

BBC: Scottish independence: Scotland 'should keep Sterling'