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This article explores the reasons why the British Prime Minister has entrusted Parliament with the decision to authorize military interventions. The precedent set by the March 2003 vote authorizing intervention in Iraq was confirmed by the March 2011 vote on strikes against Gaddafi’s Libyan regime, while the House of Commons opposed intervention against Bashar al-Assad in 2013 but approved strikes against the Islamic State in 2014 and 2015. The emergence of a “parliamentary prerogative” is explored to show the limits of the “Westminster model” that prevails in foreign and defense policy studies and the need to take account of negotiations with Parliament in the development of such policy.