Our Scotland Political Editor Peter MacMahon spoke to the Prime Minister during his visit to the Scottish Conservative Conference.
Watch the full interview on independence - and how it could affect the border - here:
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DR Collin, a fish trading company based in the Scottish Borders, says delays exporting its goods via Calais are costing it thousands.
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A bus route from Hawick to Kelso and Jedburgh may have been saved, but with some services cut.