London, UK. 3 May, 2019. The Duke of Cambridge and newly appointed Defence Secretary Penny Mordaunt arrive at a reception at the Queen Elizabeth II Centre following a National Service of Thanksgiving at Westminster Abbey to mark fifty years of the Continuous at Sea Deterrent (CASD). Campaigners from Campaign For Nuclear Disarmament (CND), Stop the War Coalition, the Peace Pledge Union, the Quakers and other faith groups protested outside against the holding of the service throughout its duration.