Who Wasn't Deported - and Why

The gap between people the government judges should be removed and people who actually leave is one of the most politically charged topics in UK immigration policy. The official figure is stark: as of September 2023, 11,800 foreign nationals liable to deportation were living in the community - not in prison, not in a detention centre, but free in the UK. That is a 192% increase from the 2012 figure, according to the Crown Prosecution Service.

The single largest mechanism keeping people in the country is the immigration tribunal system. In 2025, 63,000 asylum appeals were submitted to the First-tier Tribunal (Immigration and Asylum Chamber) - 69% more than in 2024. Of cases decided, 47% were allowed, meaning an independent judge overturned the Home Office's original refusal. It is important to note what this means: 47% success is also 53% failure - most appeals do not succeed. But for removal cases specifically, the appeals process creates a period during which a person cannot be removed, and with 80,000 cases in the backlog, some people wait years for their appeal to be heard.

The principal legal grounds for blocking a deportation are the European Convention on Human Rights, applied by UK courts. Article 3 prohibits return to a country where the person faces a real risk of torture, inhuman or degrading treatment. Article 8 protects the right to family and private life - meaning a person with a British partner, children, or long UK residence may successfully argue removal is disproportionate. The ECHR is often cited in political debate as the main barrier, but the data does not support that claim as a general rule: of 29 UK deportation cases heard by the Strasbourg court since 1980, 16 found that deportation would be lawful. ECHR blocked deportation in 13 cases.

A substantial practical barrier receives less attention: country cooperation. Several countries either refuse to issue travel documents or actively obstruct returns of their nationals from the UK. Afghanistan and Eritrea are the clearest examples in this dataset - both receive large amounts of UK foreign aid while returning very small numbers relative to their prison populations and asylum caseloads. The UK has formal readmission agreements with some countries, but not all.

Administrative failure also plays a role. In 2006, it emerged that 1,013 foreign national prisoners had been released without the Home Office considering deportation - a scandal that led to the resignation of Home Secretary Charles Clarke and prompted major policy changes. Despite those changes, the community liability stock has grown substantially since. In a 2025 case, an Ethiopian national convicted of sexual offences against a woman and a 14-year-old girl was accidentally released from prison before a deportation flight was arranged.

The detention system itself reveals the gap between detention and removal. Of the people who left immigration detention in the year ending December 2025, 51% were released on immigration bail rather than removed. Detention does not automatically lead to departure.