The EU Referendum and its aftermath further polarised identity politics by forging two new political tribes: ‘Leavers’ and ‘Remainers’. The 2016 referendum was the first national political choice to be structured primarily around identity divides. Traditional conflicts over class, income, economic ideology and economic competence were pushed into the background. Instead, it was the conflicts over identity and values which split graduates and school leavers, white voters and ethnic minorities and young and old which primarily drove voters’ Brexit choices and informed their Brexit identities. The intense referendum campaign and polarising political aftermath proved to be a moment of awakening, making voters aware of just how deeply divided they were from their political opponents. They now knew what kind of people fell into each Brexit tribe, and began to display all the classic symptoms of partisan bias when asked to judge their tribe and its opponents, seeing their own side through rose-tinted spectacles while dismissing their rivals as fools and knaves. These attachments have been consequential not only for political views but also for social life since the referendum, as the identities forged by a single political choice have taken on a life of their own.