 On becoming Leader of the Labour Party on 25 September 2010 , Miliband also became Leader of the Opposition . At 40 , he was the youngest leader of the party ever . At his first Prime Minister 's Questions on 13 October 2010 , he raised questions about the government 's announced removal of a non @-@ means tested child benefit . During the 2011 military intervention in Libya , Miliband supported UK military action against Muammar Gaddafi . Miliband spoke at a large " March for the Alternative " rally held in London on 26 March 2011 to protest against cuts to public spending , though he was criticised by some for comparing it to the anti @-@ apartheid and American civil rights movements . 
