The only person South of the Border that Mr Brown is concerned about is Mr Brown. His career prospects would be severely limited if Scotland and England were finally to stop fighting like kittens in a sack called the "United Kingdom."
Scotland may contribute something to our culture, but I am sure they will still sell us their bagpiping CD's and shortbread when they are an independent nation. As for our economy, they are Slovakia to our Czech Republic. We will be richer (and a whole lot less Socialist) without them.