Never event NHS: what it is, your rights, and how to claim

Published 6 April 2026

TL;DR

A never event NHS incident is a serious, wholly preventable patient safety incident that NHS England states should never occur if the correct safeguards are in place
The NHS Never Events List sets out the categories: wrong-site surgery, retained surgical instruments, wrong-route medication, misplaced nasogastric tubes, overdose of insulin, and others
Because a never event NHS framework identifies these incidents as categorically preventable, they will almost always constitute a Bolam breach without the need for complex expert debate about clinical judgement
Patients affected by a never event are entitled to a full apology, explanation, and investigation from the NHS trust; they may also have a legal claim for compensation
The time limit for a never event NHS claim is three years from the date of the incident or from the date of knowledge

A never event NHS incident is not simply a serious medical error. It is one of a defined set of incidents that NHS England has identified as wholly preventable when established safety protocols are followed correctly. The framework exists because these incidents share a common characteristic: there is clear national guidance and robust safety checklists to prevent them, and they occur only when those controls fail.

Understanding what a never event is matters for patients and families because the classification affects both the NHS's obligations to investigate and explain, and the legal position in any subsequent negligence claim.

What is a never event NHS policy?

The never event NHS policy was developed by NHS England to identify a group of serious incidents that are both catastrophic in their consequences and wholly preventable. NHS England defines a never event as a serious incident that is wholly preventable because guidance or safety recommendations providing strong systemic protective barriers are available at a national level and have been since before the incident occurred.

The policy requires NHS trusts and foundation trusts to report all never events to NHS England, to conduct a serious incident investigation, and to provide a full explanation to the patient or their family. The duty of candour places a legal obligation on providers to be open and honest when something goes wrong and causes harm.

The never event policy is not a legal standard in itself. It is a patient safety framework. The legal standard for a negligence claim remains the Bolam test. However, the fact that an incident appears on the Never Events List is powerful evidence in a legal claim because it demonstrates that the breach was categorically preventable, not the product of a difficult clinical judgement call.

What is on the NHS never event list?

The NHS Never Events List is published and periodically updated by NHS England. The current version groups never events into the following categories:

Wrong-site surgery: performing a surgical procedure on the wrong site of the body, the wrong patient, or the wrong procedure entirely. This includes wrong-side procedures such as operating on the left knee instead of the right.

Retained surgical instruments: leaving a surgical instrument, swab, or other item inside a patient's body after a procedure. Surgical count procedures and intraoperative imaging exist specifically to prevent this.

Wrong-route medication: administering a medication by an incorrect route. The most serious examples involve intrathecal injection of a medication intended for intravenous administration, which can cause fatal paralysis or death.

Misplaced nasogastric or orogastric tubes: inserting a feeding tube into the lungs rather than the stomach and then administering feed or medication through it. Verification protocols using pH testing and X-ray exist to prevent this.

Overdose of insulin due to abbreviation: prescribing or administering insulin at a dangerous dose due to a misread or ambiguous abbreviation. International guidance standardises how insulin doses must be written to prevent this.

Falls from poorly restricted windows: a patient falling from a window that should have been restricted. Building safety regulations and NHS guidance specify the required restrictions.

Other categories on the list cover specific high-risk medication errors, wrong implant or prosthesis selection, and scalding of patients. The full list is published on the NHS England website and updated when new systemic protective barriers are established for additional incident types.

Why a never event NHS incident almost always constitutes negligence

The Bolam test asks whether a responsible body of practitioners in the relevant specialism would have done what the defendant did. For never events, the answer is categorical: no responsible body of practitioners would perform wrong-site surgery, leave a swab inside a patient, or administer a feeding tube without verifying its position.

This is what distinguishes a never event from an adverse outcome caused by a difficult clinical judgement. Most medical negligence claims require detailed expert evidence on what a responsible clinician would or would not have done. Never event claims rarely require that debate because the standard of care is established at a systemic level. The Bolitho refinement (that a body of clinical opinion must be logically defensible) adds nothing to this analysis because there is no defensible body of opinion that would endorse a never event.

In practice, NHS trusts typically accept that a never event occurred. The dispute in litigation, if any arises, is usually about causation: what harm did the never event cause beyond the harm that would have occurred anyway? For a retained swab causing repeated infections, the causation question is relatively straightforward. For a wrong-site procedure where the correct site was also operated on later, it is more complex.

What happens after a never event NHS incident?

When a never event occurs, the NHS trust is required to:

Report the incident to NHS England
Conduct a serious incident investigation under the Patient Safety Incident Response Framework (PSIRF)
Provide a full explanation and apology to the patient under the duty of candour
Share the findings of the investigation and any actions taken

You are entitled to receive a written explanation of what happened, why it happened, and what the trust is doing to prevent recurrence. This is separate from any legal claim and does not require a solicitor. However, the investigation documents, incident reports, and root cause analysis produced by the trust are often valuable evidence in a subsequent legal claim.

What compensation can you claim after a never event?

Compensation in a never event claim is assessed in the same way as any other medical negligence claim: general damages for pain, suffering, and loss of amenity, plus special damages for financial losses.

The value depends entirely on the harm caused. A retained surgical instrument discovered and removed promptly with no lasting injury attracts lower general damages than one causing repeated infection, re-operation, and permanent damage. Wrong-site surgery may cause permanent disability or require corrective procedures with their own risks. Wrong-route medication administration can cause paralysis, brain damage, or death, with compensation reaching catastrophic injury levels.

General damages are assessed using the Judicial College Guidelines (17th edition, April 2024). The relevant bracket depends on the injury resulting from the never event rather than the classification of the incident itself. For details of the compensation ranges that apply to specific injuries, see the compensation guide.

Time limits and how to start a claim

The time limit for a never event NHS claim is three years from the date of the incident, or three years from the date of knowledge if the harm only became apparent later. The date of knowledge is the date you knew (or should have known) that the harm was attributable to the never event.

In most never event cases, the trust discloses the incident relatively promptly under its duty of candour obligations, so the limitation period usually runs from the date of the incident. Legal advice should be sought as early as possible to preserve evidence and begin the claim within the limitation period.

For the full step-by-step process from instruction through to settlement, see the how to claim guide. For the time limits rules including exceptions, see the time limits guide. Most solicitors handling never event claims work on a conditional fee basis: for how this works, see the funding guide.

For a full explanation of medical negligence and how the Bolam test applies, see the main guide.

This page provides legal information, not legal advice. If you or a family member has been affected by a never event, speak to a qualified solicitor who specialises in clinical negligence.