Health and Safety Prosecution Defence: What to Do After an HSE Investigation

Health and safety investigations can lead to improvement notices, prohibition notices, interviews under caution, prosecution and serious reputational harm. Early advice can make a major difference.

When can a health and safety investigation become a prosecution?

A health and safety investigation can begin after a workplace accident, fatality, complaint, inspection, RIDDOR report or concern raised by the Health and Safety Executive or a local authority. Not every investigation leads to prosecution, but the risk should be taken seriously from the outset. The authorities may examine risk assessments, training records, safe systems of work, equipment maintenance, supervision, contractor management, accident history and the actions of directors, managers and employees. Where serious failings are alleged, the investigation may move towards enforcement notices, interviews under caution or prosecution.

What should you do immediately after a serious incident?

The first priority is safety. Make sure any ongoing risk is controlled and that the injured person receives appropriate support. After that, preserve evidence, record what happened, secure CCTV, keep equipment safe, identify witnesses and avoid informal assumptions about fault. Internal investigation is important, but it must be handled carefully. Notes, reports and emails created after an incident may later be requested or relied upon. Legal advice can help ensure the business investigates responsibly while protecting its position.

Improvement notices and prohibition notices

Health and safety enforcement action can include improvement notices, prohibition notices and prosecution. An improvement notice usually requires specific remedial steps by a deadline. A prohibition notice can stop an activity where there is a risk of serious personal injury. Businesses should take notices seriously and seek advice quickly if there are grounds to challenge them or if compliance will have operational consequences. The wording of a notice, the deadline, the alleged breach and the evidence behind it all matter.

What is an HSE interview under caution?

An interview under caution is a formal interview where answers may be used in evidence. It is not a casual meeting. The questions may focus on what happened, who was responsible, what systems were in place, what documents say and whether the business or individuals breached health and safety duties. Anyone invited to an interview under caution should obtain legal advice before attending. Preparation can help identify the issues, review the evidence, understand the risks and decide how best to respond.

Can directors or managers be personally investigated?

Yes. Health and safety investigations may look not only at the company but also at the conduct of directors, managers or employees. Personal exposure will depend on the facts, the role held, the knowledge of the individual and the extent of control or responsibility. This is one reason why businesses should avoid assuming that one solicitor can automatically advise every person involved without considering conflicts of interest. In some cases, separate advice may be needed.

How can a defence be built?

A health and safety prosecution defence usually starts with a detailed review of the evidence. This may include incident reports, risk assessments, training documents, maintenance records, photographs, witness statements, expert evidence and correspondence with the regulator. The defence may involve challenging the alleged breach, causation, foreseeability, the level of risk, the adequacy of existing systems, the role of contractors, or the level of culpability. Where there has been a breach, the focus may shift to mitigation, corrective action and reducing the seriousness of the outcome.

Why early legal advice matters

The early stages of a health and safety investigation are often the most important. Decisions about documents, interviews, notices, internal reports and communications can have long-term consequences. Adkirk Law advises businesses, directors, managers and individuals facing health and safety investigations, notices, interviews under caution, inquests and prosecutions. If you are dealing with an HSE or local authority investigation, contact our regulatory team for practical advice. Related topics : Health and Safety enforcements and prosecutions