Detention — being held somewhere against your will — is one of the most serious interferences with personal liberty that the law recognises. When it is authorised by law and carried out correctly, it can be entirely lawful. When it is not, it becomes unlawful detention — a serious breach of your fundamental rights that gives rise to legal remedies including compensation. Understanding the difference matters, because many people who have been unlawfully detained do not realise they have grounds to challenge it or claim redress.
Our criminal defence solicitors in Bolton advise clients on unlawful detention and wrongful arrest, and can assess whether the circumstances of your detention were lawful from the outset.
The Legal Definition of Unlawful Detention
Unlawful detention — also known in civil law as false imprisonment — occurs when a person is held, restrained, or confined without lawful authority. It is not limited to situations involving a locked room or physical restraint. In law, detention is unlawful whenever a person is prevented from leaving a place freely, without legal justification for that restriction.
This means unlawful detention can occur in a surprisingly wide range of situations:
- Being held at a police station beyond the permitted time limits without proper authorisation
- Being arrested without reasonable grounds
- Being kept in a shop or office against your will by a security guard or employer
- Being held in immigration detention when the legal conditions for detention are not met
- Being refused discharge from a hospital or care facility without lawful authority
The key question in every case is the same — was there a lawful basis for the detention at the time it occurred, and was that basis properly exercised? If the answer to either part is no, the detention may be unlawful.
Lawful vs Unlawful Detention — What Makes the Difference?
Not all detention is unlawful. The law authorises detention in various circumstances, but that authority has strict limits. Understanding where those limits lie is the starting point for any unlawful detention claim.
Police Detention
The primary legislation governing police detention in England and Wales is the Police and Criminal Evidence Act 1984 (PACE). PACE sets out the circumstances in which the police can arrest and detain a person, the conditions under which detention can be authorised, and the time limits within which a person must either be charged or released.
Police detention is lawful where:
- The officer had reasonable grounds to suspect the person of committing an offence
- The arrest was necessary for one or more of the statutory purposes set out in PACE (such as to allow the prompt and effective investigation of the offence)
- Detention was authorised by a custody officer
- The applicable time limits have not been exceeded
Where any of these conditions are not met — for example, where an officer had no genuine reasonable suspicion, or where a person is held beyond the permitted time without further authorisation — the detention becomes unlawful.
Immigration Detention
Immigration detention operates under a separate legal framework and is governed by the Immigration Acts and associated rules. The Home Office has the power to detain individuals pending removal from the UK, but that power is subject to important limitations. Detention must be proportionate, it must be for the purpose of effecting removal that can be achieved within a reasonable period, and it must be reviewed regularly.
Where those conditions are not satisfied — for example where there is no realistic prospect of removal in the foreseeable future, or where the person has vulnerabilities that make detention inappropriate — the detention may be unlawful and is subject to challenge. Our Human Rights Application team regularly advises on the interface between immigration detention and Article 5 of the European Convention on Human Rights, which enshrines the right to liberty.
Detention by Private Individuals or Organisations
Private individuals and organisations — including security guards, employers, and healthcare providers — also have very limited powers to detain people. A security guard, for example, may be able to detain a shoplifter for a brief period to await the police, but only where there are reasonable grounds to believe a theft has occurred and the detention is no longer than necessary.
Any detention beyond what is strictly authorised in these circumstances will be unlawful, regardless of the intentions of the person detaining you.
The Civil Wrong of False Imprisonment
In civil law, unlawful detention is known as false imprisonment. It is a tort — a civil wrong — and gives the person who has been detained the right to sue for damages. False imprisonment does not require any physical force, threat of force, or formal arrest — it is committed the moment a person is prevented from leaving a place without lawful justification.
Importantly, false imprisonment is actionable without proof of loss. This means you do not have to show that the unlawful detention caused you specific financial harm — the detention itself gives rise to a right to claim compensation, which can include damages for the detention itself, any distress or psychological harm caused, and any consequential losses such as lost earnings.
Article 5 of the European Convention on Human Rights
Article 5 of the European Convention on Human Rights protects the right to liberty and security. It provides that no one shall be deprived of their liberty except in limited, specified circumstances and in accordance with a procedure prescribed by law. These circumstances include lawful arrest or detention by police following conviction by a competent court, or detention pending deportation.
Where detention falls outside these permitted grounds, or where the required legal procedures were not followed, Article 5 is breached. Human rights claims can be brought in the domestic courts under the Human Rights Act 1998 and, in appropriate cases, before the European Court of Human Rights in Strasbourg.
What Can You Do If You Have Been Unlawfully Detained?
If you believe you have been unlawfully detained, several legal routes are available depending on the circumstances:
Civil claim for false imprisonment — you can bring a civil claim for damages against whoever was responsible for the unlawful detention, whether that is the police, a government agency, or a private individual or organisation.
Judicial review — where a public authority such as the police or immigration enforcement is responsible, a judicial review application can challenge the lawfulness of the decision to detain and seek a declaration, damages, and other remedies.
Habeas corpus — this is one of the oldest and most fundamental legal remedies in English law. It allows a person who is being unlawfully detained to apply to the High Court for an order requiring their immediate release.
Complaint to the Independent Office for Police Conduct (IOPC) — where police conduct led to the unlawful detention, a formal complaint to the IOPC is an additional avenue, though it does not preclude a civil claim.
Our unlawful detention solicitors will advise on which route is most appropriate for your circumstances and represent you throughout.
How Hi Solicitors Can Help
If you believe you have been unlawfully detained — whether by the police, immigration authorities, or any other body — our solicitors in Bolton can assess the circumstances of your case and advise you clearly on your legal options. We act quickly because in many cases time limits apply and the sooner advice is taken, the stronger the position.
If you are currently being detained and believe that detention is unlawful, contact us immediately. Our police station representation team is available 24 hours a day, 7 days a week.
Call 01204 371 414 for a free initial consultation. All enquiries are treated in the strictest confidence.
187b Derby St, Bolton, BL3 6JT · hisolicitors.co.uk
Frequently Asked Questions
Q: What is the difference between unlawful detention and false imprisonment?
They are two ways of describing the same thing. Unlawful detention is the general term for being held without legal authority. False imprisonment is the specific civil law term for the same conduct — it is the cause of action that gives rise to a right to claim compensation in a civil court. The two terms are often used interchangeably.
Q: Can the police detain you without arresting you?
In limited circumstances, yes — for example, a stop and search under section 1 of PACE or section 60 of the Criminal Justice and Public Order Act 1994 allows the police to detain you briefly for the purpose of a search without formally arresting you. However, this power is tightly limited in both scope and duration. Any detention that goes beyond what the specific power authorises will be unlawful.
Q: Does unlawful detention have to involve physical force?
No. False imprisonment is committed whenever a person is prevented from leaving a place freely, without lawful authority. It does not require physical restraint, threats, or force. If you genuinely believed you were not free to leave and that belief was reasonable in the circumstances, the detention may be unlawful even where no physical force was used.
Q: How long does the police have to detain you before it becomes unlawful?
This depends on the type of offence and what authorisations have been obtained. In most cases the initial lawful detention period is 24 hours, after which further detention must be authorised by a superintendent (up to 36 hours) or a magistrates’ court (up to 96 hours). Holding someone beyond the applicable time limit without proper authorisation is unlawful detention.
Q: Can you claim compensation for unlawful detention?
Yes. A civil claim for false imprisonment allows you to recover damages for the period of unlawful detention itself, any distress or psychological harm suffered, and any consequential financial losses. You do not need to prove that specific financial loss was caused — the detention itself is the wrong that gives rise to the right to claim.