The Border region could be hardest hit if Scotland becomes independent, according to the Deputy Prime Minister.
Speaking at the Liberal Democrat conference in Glasgow, he told ITV News that a 'yes' vote this time next year would destroy trade in the region.
More top news
Wintry start for some and windy. Brightening later
Emma brings you Saturday's forecast
Longest cold spell of winter so far. Mainly dry and bright, but feeling bitterly cold today. Very wintry further east, blizzards possible