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Detain and deport illegal migrants

Reform UK · what the evidence says

An independent, source-checked look at Reform UK’s policy “Detain and deport illegal migrants” — what it would actually do across the things that affect your life. Every claim below quotes the source behind it. How this works.

Personal liberty & free speech — Hurts

major · moderate confidence

This policy would significantly expand state detention powers, remove key legal protections by leaving the ECHR, and strip non-citizens of legal aid — all of which reduce the practical ability to challenge state coercion. The main caveat is that most effects fall on non-citizens rather than the general population, though ECHR withdrawal would reduce rights-enforcement tools for everyone.

The evidence

Biggest unknown: Whether leaving the ECHR and replacing it with a British Bill of Rights would in practice preserve, reduce, or restructure the individual rights currently enforceable against the state — the scope of the replacement instrument is unspecified.

Our reading: O10 concerns freedom from state coercion, detention, and the practical ability to challenge state power. This policy worsens it across several distinct mechanisms. First, it authorises mass detention at scale without specifying procedural safeguards. Detention is among the most direct forms of state coercion over bodies and movement. Second, leaving the ECHR removes a structural check on state power. The projected consequence (E15) is that this would reduce the power of ordinary people to protect their rights and create years of legal uncertainty. This is not limited to migrants: it affects anyone whose rights are currently enforceable via the Human Rights Act and ECHR framework. This is a projection by an advocacy body and should be weighted accordingly, but no cited evidence points the other way on this mechanism. Third, eliminating legal aid for non-citizens removes the practical ability to challenge state coercion through the courts. The measurable baseline (E27) shows appeal success rates collapsed from 46% to 12% after earlier legal aid cuts; extending the ban further entrenches this gap. The policy builds on LASPO cuts already documented as having significantly reduced immigration legal aid scope (E25). Fourth, the blanket bar on asylum claims from safe-country entrants and the potential to strip permanent residents of settled status (E18, projected) represent expanded state power to determine people's legal existence with reduced avenues for challenge. Counterfactual: absent this policy, ECHR protections, legal aid entitlements, and existing detention limits remain. The policy's marginal effect is clearly in the direction of expanded state coercion and reduced individual liberty. Confidence is moderate rather than high because the replacement British Bill of Rights is unspecified, and E15 comes from an advocacy source (justice.org.uk), though no cited evidence contradicts it.

Public finances & the next generation — Hurts

minor · low confidence

The policy carries a confirmed £10 billion implementation cost, while the claimed savings rely on deportation targets that independent evidence suggests are far beyond what has ever been achieved in practice. The net fiscal effect is likely negative, though the true scale is deeply uncertain.

The evidence

Biggest unknown: Whether large-scale deportations are operationally achievable — if return numbers remain close to current levels, the implementation costs dominate and savings do not materialise.

Our reading: The policy's fiscal case rests on two pillars: large upfront implementation costs (£10 billion over five years, acknowledged even by the policy's own projections) and offsetting savings that depend on achieving deportation at a scale of up to 288,000 per year. The savings figures come solely from the party's own advocacy material and are not corroborated by any independent institutional source — LSE, the only independent body cited in the evidence, directly contradicts them, calling the policy 'highly costly' with 'uncertain results.' The operational record is stark: fewer than 400 small-boat arrivals were returned to the EU across six years, and a dedicated UK-France deal returned just 75 people while over 11,500 crossed. Independent experts note the deterrent effect that drives the savings model only fires if a 'relatively large proportion' of arrivals are returned — a threshold the evidence shows has never been approached. Without the savings materialising, the confirmed £10 billion implementation cost — plus the cost of building detention capacity for 24,000 people and running a new government department — represents a net fiscal deterioration over the parliamentary term. The long-run picture is no more favourable: savings projections depend on a mechanism that historical evidence does not support at anything close to the required scale. The direction verdict is 'worsens,' but confidence is 'low' because the magnitude is genuinely uncertain: if some operational improvement were achieved beyond current baselines, costs could be partially offset. The savings claims from the party cannot be treated as independent evidence, so the weight of cited evidence points to net fiscal cost rather than gain.

Crime, justice & national security — Hurts

minor · low confidence

The policy aims to improve border security but evidence suggests it is unlikely to deter Channel crossings at the scale needed, while removal of legal aid for non-citizens is linked to more appeals clogging the justice system, and leaving the ECHR would make cross-border crime cooperation harder. The net effect on crime, justice and security is slightly negative, though highly uncertain.

The evidence

Biggest unknown: Whether a large-scale deportation operation could actually achieve returns sufficient to create a deterrent effect — current evidence suggests the infrastructure and international agreements needed do not exist.

Our reading: O5 covers crime rates, court backlogs, national security posture, and justice system functioning. The policy has a plausible pathway to improving border security — reducing illegal migration could in principle reduce associated enforcement demands — but the evidence on deterrence is consistently weak. Only 400 small-boat arrivals were returned to the EU across six years out of 151,000, and a recent UK-France deal returned just 75 people while 11,500 crossed. Independent analysis is explicit that a deterrent effect requires returning a large proportion of arrivals, a bar current or proposed mechanisms have not cleared. LSE analysis describes the programme as highly costly with uncertain results. On justice system functioning — a direct O5 indicator — the evidence points the other way. Removing legal aid for non-citizens is the same lever pulled by LASPO; the empirical outcome after LASPO was a 60% increase in asylum appeals, worsening court backlogs. Finally, ECHR withdrawal would damage cross-border cooperation on crime and migration, according to the evidence, directly harming the UK's security cooperation posture. The net picture is that the two clearest mechanisms linking this policy to O5 — the justice system and international crime cooperation — point toward worsening, while the main improvement pathway (deterrence via returns) lacks evidential support at the scale required. The direction is a minor worsening, held at low confidence because the deterrence question is genuinely unresolved and the magnitude of each effect is hard to isolate from provided evidence.

Equal treatment & democratic rights — Hurts

major · moderate confidence

This policy would remove legal aid for non-citizens, withdraw from the ECHR, and impose blanket bans on asylum claims — all of which weaken due process and equal treatment protections for a large group of people in the UK. The main caveat is that several sources flagging harms come from advocacy organisations, though parliamentary and academic sources confirm the core due-process and rights concerns.

The evidence

Biggest unknown: Whether a British Bill of Rights replacing the ECHR would restore equivalent individual protections in practice, and how courts would interpret residual international obligations.

Our reading: O9 covers due process, equal treatment, minority protections, and the rule of law. This policy operates on all four simultaneously, in a worsening direction. On due process: the complete removal of legal aid for non-citizens eliminates the principal mechanism by which people in detention or facing deportation can challenge decisions. The LASPO precedent — where a partial reduction in legal aid caused self-represented success rates to drop from 46% to 12% — provides a measurable analogue. A total exclusion would be expected to compound this effect. People with valid claims, including those fleeing persecution, would face removal without meaningful ability to appeal. On equal treatment and minority protections: blanket bars on asylum claims for people arriving from 'safe countries' go beyond the existing inadmissibility framework (which prioritises rather than prohibits). The UNHCR explicitly opposes such blanket bans. The policy would particularly harm vulnerable minorities — women fleeing gender-based violence are singled out by evidence as disproportionately affected by safe-country rules that do not account for individual circumstances. On the rule of law: leaving the ECHR removes the external framework under which individuals can hold the state to account for rights violations. The evidence confirms this would reduce individuals' power to protect their rights and create prolonged legal uncertainty. Residual obligations under the Refugee Convention and UN Convention Against Torture would remain, but enforcement mechanisms would be weakened. The magnitude is major because the three instruments — ECHR withdrawal, legal aid exclusion, and asylum claim prohibition — operate together and affect large numbers of people. Several sources flagging harm are advocacy organisations (Liberty, JUSTICE), which must be noted; however, the due-process findings are corroborated by the House of Commons Library, LSE analysis, and parliamentary committee evidence, so confidence is moderate rather than low. The counterfactual (absent this policy, existing ECHR and legal aid frameworks provide imperfect but real protections) is supported by the LASPO data.

Immigration & border control — Moves toward more control

We don’t call this better or worse — that’s your call; we only show which way the policy moves it.

major · moderate confidence

This policy would move the UK significantly toward tighter border control by detaining and deporting irregular migrants, leaving the ECHR, and barring asylum claims from safe-country arrivals. The main caveat is that the practical scale of returns achieved may fall well short of the stated targets, given the very low numbers returned so far.

The evidence

Biggest unknown: Whether bilateral agreements with France and other countries can be secured to enable returns at the intended scale, given that only around 75 immigrants were returned to France in a recent period when nearly 11,500 crossed the Channel.

Our reading: The policy clearly moves in the direction of more controlled immigration and lower net migration across multiple mechanisms: mass detention and deportation targets, interception of small boat crossings, ECHR withdrawal to remove legal barriers to removal, and a blanket bar on asylum claims from safe-country arrivals. The intended scale is major — hundreds of thousands of deportations are targeted. However, confidence is only moderate because evidence shows current return numbers are extremely low (400 small boat arrivals returned to the EU over six years; 75 to France in a recent multi-month period), independent analysts flag high costs and uncertain delivery, and leaving the ECHR would still leave UK bound by other international obligations. The direction is unambiguous; the degree to which it would be achieved in practice is genuinely uncertain.

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