Britain's Prime Minister David Cameron, left, Deputy Prime Minister Nick Clegg, center, and Labour party leader Ed Miliband attend the Service of Commemoration – Afghanistan, at St Paul's Cathedral in London, Friday, March 13, 2015. The Queen and Britain's prime minister are joining veterans in a service to commemorate the end of Britain's combat operations in Afghanistan. Almost 150,000 Britons served in the conflict, and 453 died. (AP Photo/John Stillwell, Pool) (The Associated Press)
LONDON – The leader of Britain's main opposition Labour Party has ruled out forming a coalition government with the separatist Scottish National Party after May's national election.