Gordon Brown's chief lieutenant today heralded the sell-off of UK plc. Treasury minister Ed Balls said the Government will not block an American takeover of the London Stock Exchange. And in an interview with the Evening Standard, he declared that no ordinary City firm should be immune to a foreign takeover. "I think we gain from having the best talent and expertise - and that applies whether we are talking about investment banks, insurance companies or exchanges," he said. His pro-market comments come amid worries that a possible takeover of the LSE by Nasdaq would expose it to tougher US...