Brexit had a significant but indirect impact on illegal immigration to the UK, particularly through small boat Channel crossings. Before Brexit, the UK was part of the Dublin system, which allowed for some asylum seekers to be returned to their EU country of first arrival, as well as information sharing on asylum applications made in other member states. After Brexit, this cooperation ended. Migrants in Northern France often cite the departure from Dublin as a reason for wanting to seek asylum i

Integration in the UK and the Post-Brexit immigration system - Migration Observatory