© Licensed to London News Pictures. 10/05/2016. London, UK. Former Secretary of State for Work and Pensions IAIN DUNCAN SMITH delivers a speech on the EU and social justice in Westminster, London on May 10, 2016. An in-out referendum on the UK's membership of the EU is due to be held on June 23rd, 2016. Photo credit: Tolga Akmen/LNP