What Happens When Health and Safety Goes Wrong?
Every year, the Health and Safety Executive (HSE) investigates workplace accidents and incidents across the UK — and in many cases, what they find is the same root cause: no safe system of work in place. A lack of basic precautions, training or supervision can turn an everyday task into a serious, sometimes life-changing, accident.
How HSE Responds to Workplace Accidents
Following a serious accident, the HSE (or local authority, depending on the type of workplace) may investigate to establish whether health and safety law was breached, and whether the accident could have been prevented. Depending on what they find, enforcement action can include:
- Improvement notices — requiring specific changes within a set timeframe
- Prohibition notices — stopping a dangerous activity or use of equipment immediately
- Fee for Intervention (FFI) — recovering the cost of investigation from businesses found in material breach of the law
- Prosecution — for the most serious breaches, which can result in substantial fines or, in extreme cases, imprisonment
How Large Can the Fines Be?
Since the Sentencing Council's Health and Safety Offences, Corporate Manslaughter and Food Safety and Hygiene Offences Definitive Guideline came into force in 2016, fines for health and safety offences are linked to the size and turnover of the organisation as well as the seriousness of the breach. For large organisations with the most serious culpability, fines can run into millions of pounds — and there's no upper limit. On top of any fine, businesses also typically face court costs, compensation claims, and the cost of putting things right.
The Most Common Root Causes
Investigations into serious accidents repeatedly identify the same underlying issues:
- No risk assessment, or a risk assessment that wasn't acted on
- Lack of training for the task being carried out
- No safe system of work for routine but hazardous tasks, such as clearing blockages on machinery
- Inadequate supervision, particularly for new or temporary staff
The good news is that all of these are entirely preventable with the right training and management commitment.
Building a Strong Safety Culture Through Training
There are plenty of affordable and accessible courses to help employees, supervisors, managers and business owners understand their legal duties. A widely recognised starting point is the NEBOSH General Certificate in Occupational Health and Safety (renamed GNC1/GNC2 from February 2026), which covers how to spot and control hazards and build genuinely safe systems of work. We offer multiple courses from NEBOSH, IOSH, CIEH and more, covering every level of responsibility.
If an accident does occur, the NEBOSH HSE Introduction to Incident Investigation course teaches how to investigate properly — not to find someone to blame, but to identify the root cause and prevent it happening again.
Frequently Asked Questions
What's the difference between an improvement notice and a prohibition notice?
An improvement notice gives a business time to fix a problem. A prohibition notice stops an activity immediately because it presents a risk of serious injury — work can't resume until the issue has been addressed.
Is there a limit to health and safety fines?
No. Under current sentencing guidelines, fines are scaled according to the size of the organisation and the seriousness of the breach, and for the largest organisations with the most serious failings, there's no cap.
How can training help reduce the risk of prosecution?
Training helps employers demonstrate they've taken reasonably practicable steps to manage risks — covering risk assessment, safe systems of work, and incident investigation — which is exactly what the HSE looks for when assessing whether a breach has occurred.