LONDON, ENGLAND - APRIL 08:  The Liberal Democrat's shadow chancellor Vince Cable visits the 'Stage Technologies' warehouse in Brent, on April 8, 2010 in London, England. The General Election, to be held on May 6, 2010 is set to be one of the most closely fought political contests in recent times with all main party leaders embarking on a four week campaign to win the votes of the United Kingdom electorate.  (Photo by Dan Kitwood/Getty Images)