By Melanie Griffiths and

Peter William Walsh

This briefing examines immigration detention in the UK. It discusses who is detained, for how long, with what effects, and the financial costs of operating the system.

Key Points Immigration detention is used worldwide by governments to facilitate immigration enforcement, but has negative impacts on detainees’ mental health. The use of immigration detention in the UK hit a high of around 32,000 in 2015. Numbers have been falling since then, with around 16,000 people entering detention in 2023. Around 1,800 people were in immigration detention on 30 June 2024. In mid-2024, the UK had an estimated detention capacity of around 2,200 beds, of which around 77% were occupied. In 2023, the Home Office detained 18 children for immigration-related purposes, down from around 1,100 in 2009. In 2023, 39% of immigration detainees were held for more than 28 days. Release on immigration bail – an alternative to detention where detainees are released into the community – increased from 2010 to 2021 but fell by 2023. In Q2 2024, the average daily cost to hold an individual in immigration detention was £122. In the financial year 2023-24, the Home Office issued 838 compensation payments for unlawful detention, totalling around £12 million.

Oxford, UK: Migration Observatory, University of Oxford, 2024. 18p.

By Matthias Lücke , Helena Hahn , Silvia Carta , Martin Ruhs , Mehari Taddele Maru , Paweł Kaczmarczyk , Karolina Łukasiewicz , Marta Pachocka , Tobias Heidland

Recent geopolitical events like Russia’s invasion of Ukraine and the instrumentalisation of migration from Belarus to Poland are re-shaping the EU's migration policy. To build a resilient migration and asylum system, the EU and its member states must find a way to balance ad hoc, crisis-oriented responses with a long-term, strategic approach. This is one of the main findings of the 2022 MEDAM Assessment Report “Refugee protection in the EU: Building resilience to geopolitical conflict”.

This final report concludes the Mercator Dialogue on Asylum and Migration (MEDAM). Launched in 2016, the project aimed to develop concrete proposals to reform EU asylum and migration policy based on in-depth research. The report considers the most recent developments in the European migration system and reflects on how the numerous crises facing the EU influence the negotiations on the New Pact on Migration and Asylum, proposed in 2020, and public perception of migrants and refugees.

As Russia continues to wage war against Ukraine, the report provides an insightful analysis of refugee movements from Ukraine to Europe since February 2022. The authors discuss the effectiveness of the TPD and future challenges that the war's outcome can pose.

The report also considers general, global migration trends. First, it looks more closely at the link between migration and development policies. The report advances the argument that the relation between economic development, foreign aid, and out-migration is a complex one, challenging the widespread belief that better economic conditions encourage migration. The report also explores the preconditions for effective cooperation on migration management with countries of origin and transit, with a particular focus on EU-Africa relations.

Recent geopolitical events have put migration and asylum back at the centre of EU policymaking. Yet, member states are still struggling to find a common, structured and effective response. Finding a way to bridge their deep-seated differences will be vital to ensure that the EU is ready to navigate future crises.

MEDAM Assessment Report . Kiel, Germany: Kiel Institute for the World Economy (IfW) Mercator Dialogue on Asylum and Migration (MEDAM). 2022. 92p.

By Hannah Jones , Yasmin Gunaratnam , Gargi Bhattacharyya , William Davies , Sukhwant Dhaliwal , Kirsten Forkert , Emma Jackson and Roiyah Saltus

The 2013 Go Home vans marked a turning point in government-sponsored communication designed to demonstrate control and toughness on immigration. In this study, the authors explore the effects of this toughness: on policy, public debate, pro-migrant and anti-racist activism, and on the everyday lives of people in Britain. Bringing together an authorial team of eight respected social researchers, alongside the voices of community organisations, policy makers, migrants and citizens, and with an afterword by journalist Kiri Kankhwende, this is an important intervention in one of the most heated social issues of our time."

Manchester, UK: Manchester University Press, 2017. 204p.