Introduction - The nested games of the UK’s EU referendum: ruptures, reconfigurations and lessons for Europe 1. Brexit and Trump: contesting new cleavage formation 2. Brexit, nationalism and disintegration in the European Union and the United Kingdom 3. Labour and the Interplay of Brexit and Electoral Politics 4. Post-Brexit nationalism: challenging the British political tradition? 5. Theresa May, the Brexit negotiations and the two-level game, 2017–2019 6. From UKIP to the Brexit party: the politicization of European integration and disruptive impact on national and European arenas 7. The post-referendum reconfigurations of conservative cleavages around black and Asian minority ethnic MPs 8. Northern Ireland and Brexit: where sovereignty and stability collide? 9. Disintegration reversed: Brexit and the cohesiveness of the EU27