A British exit from the European Union could wreck London's position as the only financial centre to rival New York and isolate the country's economy, research ordered by a lobby group for banks and money managers showed.
Prime Minister David Cameron has promised to renegotiate the terms of Britain's EU membership and hold an "in-out" referendum by the end of 2017 if his Conservatives win a 2015 national election.
image: http://www.freedigitalphotos.net