This book examines the result of the 23 June 2016 UK referendum on leaving the EU where 51.9% of the eligible voters who voted chose to leave. Politicians and media have stressed not only that leave means leave, but also that much of the British voting public was motivated to vote leave by issues of immigration and border control. Guild investigates how the issue of EU citizenship became transformed into a discussion about immigration through four themes: the negotiations between the UK and the EU before the referendum; the nature of and difference between British and EU citizenship; the issue of third country national family members and the fears incited by the referendum in light of the rejection of expertise.