Britain's opposition Conservative Party leader Cameron speaks with nurses at University College Hospital in London

 
Britain
Britain's opposition Conservative Party leader David Cameron (C) speaks with nurses in the teenage cancer trust unit at University College Hospital in London April 5, 2010. Britain's Prime Minister Gordon Brown is expected to call on Tuesday for an election to be held on May 6. REUTERS/Richard Pohle/POOL (BRITAIN - Tags: POLITICS ELECTIONS HEALTH)