End Immigration Detention of Children and Limit Adult Detention
Liberal Democrat · what the evidence says
An independent, source-checked look at Liberal Democrat’s policy “End Immigration Detention of Children and Limit Adult Detention” — 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 — Helps
moderate · moderate confidence
This policy directly reduces state coercion by ending child detention and capping adult immigration detention at 28 days, which expands bodily liberty for those affected. The main caveat is that alternatives like electronic tagging can themselves extend surveillance, partially offsetting the liberty gain.
The evidence
- The policy ends detention of children for immigration purposes and limits adult detention to a 28-day maximum as an absolute last resort. — libdems.org.uk (manifesto) — “End the detention of children for immigration purposes, and reduce detention for adults to an absolute last resort, with a 28-day time limit.”
- The UK is currently the only country in Europe without a statutory time limit on immigration detention, meaning detention can and does extend indefinitely. — theguardian.com (media) — “The UK is currently the only country in Europe without a statutory time limit on the length of immigration detention”
- In 2023, 39% of immigration detainees were held for more than 28 days, meaning a 28-day limit would directly constrain detention of a substantial share of detainees. — migrationobservatory.ox.ac.uk (academic) — “In 2023, 39% of immigration detainees were held for more than 28 days”
- Uncommenced powers under the Illegal Migration Act 2023 would have allowed child detention without any time limit; these are expected to be repealed. — asylumineurope.org (media) — “The Illegal Migration Act 2023 contained powers to detain children without a time limit, though these were never commenced and are expected to be repealed”
- Some alternatives to detention, such as electronic tagging, have been criticised for extending surveillance and causing distress to those subject to them. — migrantsorganise.org (media) — “some ATDs like electronic tagging have been criticised for extending surveillance and causing distress”
Biggest unknown: Whether alternatives to detention — especially electronic monitoring — are designed in ways that minimise surveillance intrusion, or whether they merely substitute one form of coercive control for another.
Our reading: O10 is concerned with freedom from state coercion over bodies and choices. Immigration detention is a direct, coercive deprivation of bodily liberty imposed by the state. This policy has two distinct liberty-expanding effects: it categorically ends child detention, removing an entire coercive power from the state; and it caps adult detention at 28 days, imposing a statutory constraint where currently none exists. The evidential basis for real-world effect is solid: the UK uniquely lacks any statutory time limit (E9), and in 2023 nearly 40% of detainees were held beyond 28 days (E10), so the cap is not merely symbolic — it would directly curtail ongoing detention for a material share of those affected. The uncommenced child-detention powers in the 2023 Act (E3) underscore that without this policy, an expansion of coercive power over children remains a legal possibility. The liberty improvement is therefore both categorical (children) and quantified at the margin (adults held over 28 days). The partial offset comes from alternatives to detention. Electronic monitoring is one cited alternative (E20), and evidence flags that tagging has been criticised for extending surveillance and causing distress (E21). This means the policy does not eliminate state coercion entirely — it shifts some of it from physical detention to surveillance. Well-designed community-based programmes avoid this (E22), but the policy text does not specify which alternatives will be used, leaving a genuine uncertainty about net liberty effect for those moved onto ATDs. On balance, ending indefinite detention and removing child detention outright are unambiguous reductions in coercive state power. The surveillance substitution risk is real but partial and conditional. The direction is clearly improves; magnitude is moderate because it affects a definable population (not the general public) but involves a meaningful curtailment of one of the most severe forms of state coercion — physical deprivation of liberty.
Crime, justice & national security — Little effect
minor · low confidence
Limiting immigration detention has little direct bearing on crime rates or national security: absconding rates under alternatives to detention are very low, and the policy's main effects fall on civil liberties and welfare rather than public safety. There is genuine but thin evidence that reduced detention capacity could marginally complicate removals, but no cited evidence this translates into measurable harm to safety or order.
The evidence
- The policy ends detention of children and limits adult detention to 28 days as a last resort. — libdems.org.uk (manifesto) — “End the detention of children for immigration purposes, and reduce detention for adults to an absolute last resort, with a 28-day time limit.”
- Absconding rates among those on alternatives to detention are low, at 1–3% in recent years. — detentionaction.org.uk (media) — “absconding rates are low (1-3% in recent years), and ATDs can further reduce these rates”
- Critics argue limiting detention could hinder removals or increase absconding risks, but evidence from alternatives-to-detention pilots contradicts this. — detentionaction.org.uk (media) — “Critics of limiting detention might argue that it could hinder removals or increase absconding risks, though evidence from ATD pilots suggests otherwise”
- 39% of immigration detainees were held for more than 28 days in 2023, meaning a cap would directly affect a substantial minority. — migrationobservatory.ox.ac.uk (academic) — “In 2023, 39% of immigration detainees were held for more than 28 days”
- Some government perspectives emphasise detention as necessary for maintaining effective immigration control and facilitating removals. — migrationobservatory.ox.ac.uk (academic) — “some government perspectives, as reflected in the justification for current detention practices, emphasise the necessity of detention for "maintaining effective immigration control" and facilitating removals”
Biggest unknown: Whether a 28-day cap would materially reduce removal rates and, if so, whether that would affect crime or security indicators at population scale.
Our reading: O5 asks whether streets are safer, the country more secure, and justice functioning better. This policy's primary effects are on welfare and liberty (O10), not on crime or national security. The most direct O5-relevant question is whether limiting detention capacity increases risk through non-compliance or failed removals. The cited evidence cuts against this concern: absconding rates under alternatives to detention are 1–3%, and pilots show compliance can be maintained without prolonged detention. A substantial minority (39%) are currently held beyond 28 days, so a cap has real operational bite — but the mechanism by which this would worsen crime rates or national security is not evidenced in the provided units. The government-side argument (E28) asserts detention is necessary for immigration control, but that is an assertion about operational preference, not a demonstrated link to O5 indicators such as crime rates or security posture. Because the policy touches O5 only obliquely, and the best available evidence shows alternatives maintain compliance, the effect on the protective goods O5 measures is minor at most and highly uncertain in direction. 'Negligible' captures this better than 'too-uncertain', because the uncertainty is not about a genuine crux that credible analysts dispute on O5 grounds specifically — it is simply that the policy's main effects lie elsewhere.
Equal treatment & democratic rights — Helps
moderate · moderate confidence
Ending child detention and capping adult detention at 28 days would strengthen due-process protections and bring the UK in line with international human rights standards on equal treatment of migrants. The main caveat is that the scale of child detention is already very small, so the practical gain there is limited, while the adult limit addresses a larger and more active rights gap.
The evidence
- The policy would end detention of children for immigration purposes and cap adult detention at 28 days as a last resort. — libdems.org.uk (manifesto) — “End the detention of children for immigration purposes, and reduce detention for adults to an absolute last resort, with a 28-day time limit.”
- In 2023, 39% of immigration detainees were held for more than 28 days, meaning a substantial minority are detained beyond the proposed limit. — migrationobservatory.ox.ac.uk (academic) — “In 2023, 39% of immigration detainees were held for more than 28 days”
- The Home Office paid around £12 million in compensation for unlawful detention in 2023-24, indicating systemic due-process failures. — migrationobservatory.ox.ac.uk (academic) — “the Home Office issued 838 compensation payments for unlawful detention, totalling around £12 million”
- In 2023, only 18 children were detained for immigration purposes, a substantial drop from previous figures, limiting the scale of the child detention reform. — migrationobservatory.ox.ac.uk (academic) — “In 2023, the Home Office detained 18 children for immigration-related purposes, a substantial drop from previous figures”
- The Illegal Migration Act 2023 contained powers to detain children without a time limit, though these were never commenced and are expected to be repealed. — asylumineurope.org (media) — “The Illegal Migration Act 2023 contained powers to detain children without a time limit, though these were never commenced and are expected to be repealed”
- Ending child detention would align the UK with international human rights standards which hold that detention is never in the best interests of a child. — idcoalition.org (media) — “Ending child detention would prevent these harms, aligning the UK with international human rights standards which state that detention is never in the best interests of a child”
- Adopting a 28-day limit would bring the UK in line with most other European countries, which already have statutory time limits. — theguardian.com (media) — “Adopting a 28-day limit would bring the UK in line with most other European countries, which already have statutory time limits for immigration detention”
- Some argue that limiting detention could hinder removals, though evidence from alternative-to-detention pilots suggests otherwise. — detentionaction.org.uk (media) — “Critics of limiting detention might argue that it could hinder removals or increase absconding risks, though evidence from ATD pilots suggests otherwise”
Biggest unknown: Whether a 28-day statutory limit would be enforced in practice or circumvented through loopholes, and whether the Home Office would successfully shift to alternatives that maintain compliance without extending surveillance harms.
Our reading: O9 concerns equal treatment, due-process protections, and minority rights. This policy addresses both directly. On child detention: the numbers are small (18 in 2023) but the rights dimension is clear — ending a practice that international standards characterise as inherently contrary to the best interests of the child is a genuine advance in equal treatment and due-process for one of the most vulnerable groups in the system. The uncommenced but unrepealed powers in the Illegal Migration Act 2023 represent a latent threat; removing them closes a legal gap. On adult detention: the UK's status as the only European country without a statutory time limit is a measurable due-process deficiency. With 39% of detainees held beyond 28 days in 2023 and £12 million paid in unlawful-detention compensation in 2023-24, there is concrete evidence of systemic failures in lawful treatment. A statutory 28-day cap directly addresses this by constraining executive discretion and strengthening the rule-of-law framework around detention. The counter-argument — that limiting detention hinders removals — bears on immigration control, not on whether detained individuals receive equal and fair treatment; it does not undermine the O9 verdict. The alternative-to-detention evidence (low absconding rates, pilot compliance data) suggests the rights gain is not simply displaced into non-compliance. Confidence is moderate rather than high because delivery depends on whether the Home Office genuinely shifts practice, and some alternatives (electronic tagging) carry their own dignity concerns. But the direction of effect on O9 indicators — due process, minority protection, rule of law — is clearly positive.