What Is the UK Law on Patient Restraint?

There's no single "restraint law" - which piece of legislation applies depends on the patient's legal status, and knowing which one governs a given situation matters more than most training actually covers.

The Mental Health Act 1983 provides the underlying authority to treat - and where necessary restrain - patients detained for treatment of a mental disorder; it's the foundation most restraint on a psychiatric ward ultimately rests on.

The Mental Capacity Act 2005 covers restraint of patients who lack the capacity to consent to their own care, wherever they're being treated. Section 6 specifically permits restraint where staff reasonably believe it's necessary to prevent harm to the patient, provided it's a proportionate response to the likelihood and seriousness of that harm - go beyond that threshold, and the same section is explicit that it stops being lawful restraint and becomes an unlawful deprivation of liberty instead.

The Mental Health Units (Use of Force) Act 2018 - Seni's Law - governs use of force specifically within mental health units, adding a legal duty on hospitals to have a use-of-force policy, train staff in it, and record and report every use of force.

The Human Rights Act 1998 sits underneath all of the above: Article 3 prohibits inhuman or degrading treatment, and Article 5 protects the right to liberty. Restraint that's disproportionate, punitive, or used for staff convenience rather than genuine necessity risks breaching both, regardless of which of the Acts above it was carried out under.

And common law covers what the Acts above don't reach - most directly Section 3 of the Criminal Law Act 1967, which permits "such force as is reasonable in the circumstances" to prevent a crime or protect someone from harm. This is the provision that applies to a patient who isn't detained under the Mental Health Act and has full capacity, but is behaving violently towards staff or other patients.

In practical terms: restraint as a last resort - only after de-escalation and other options have genuinely been exhausted - the least restrictive option available, clear documentation of why it was used, and a review afterwards. Staff who understand the "why" behind the law tend to make better calls under pressure than staff who've only memorised a technique - which is the gap our Physical Intervention course is built to close.

This is general guidance, not legal advice - for a specific incident or policy question, take advice from your organisation's legal team.