The South Shield by-election in 2013 was triggered by the resignation of which British Labour Party politician? 
David Miliband: David Wright Miliband (born 15 July 1965) is a British Labour Party politician, charity chief executive and public policy analyst who was the Secretary of State for Foreign and Commonwealth Affairs from 2007 to 2010 and the Member of Parliament (MP) for South Shields from 2001 to 2013.
i don't know