Is the accident book a legal document? Yes, and here's what that actually means

What the accident book actually is

The accident book, officially the HSE's BI 510 form, is the standard record used to log details of any accident or injury that happens at work. It isn't a suggestion or a piece of good practice, it's a specific legal record with a specific legal basis, and it exists separately from any first aid records, incident reports, or internal paperwork a business might also keep.

Every entry should capture who was injured, what happened, when and where it happened, and what injury resulted. It's meant to be a contemporaneous record, written at the time or as close to it as possible, not reconstructed weeks later from memory.

The entry doesn't have to be made by the injured person themselves. A colleague, manager or the first aider who attended can complete it on their behalf, which matters in practice, since the person who's just been hurt isn't always in a position to sit down and write a detailed account straight away. What matters is that someone does it promptly, while the details are still accurate.

The legal basis: it's older than most people assume

The requirement to keep an accident book doesn't come from RIDDOR, and it doesn't come from general health and safety law either. It comes from the Social Security (Claims and Payments) Regulations 1979, specifically Regulation 25, which requires employers with 10 or more employees to keep an accident book at the workplace, accessible to staff, so that any injury can be recorded at the time it happens.

In practice, HSE recommends every employer keeps one regardless of headcount, because the underlying purpose hasn't gone away just because a business is small: if someone is injured at work, they need somewhere to record it, and the employer needs a record that stands up later if a claim, inspection or dispute follows.

Accident book vs RIDDOR: two different legal duties

This is where most confusion comes from, and it's worth being precise about it, because the two obligations don't overlap the way people expect.

The accident book records every work-related injury, no matter how minor, a cut finger, a slip with no lasting harm, a strain. RIDDOR (the Reporting of Injuries, Diseases and Dangerous Occurrences Regulations) only requires you to formally notify HSE about the more serious end of that scale.

So an accident book entry doesn't always mean a RIDDOR report is needed, most entries won't reach that threshold. But a RIDDOR-reportable incident should always also have an accident book entry. They're two separate legal duties that happen to be triggered by the same event.

What actually has to be recorded

The Regulations are specific about the minimum information an entry needs. HSE's own guidance and the standard BI 510 layout both require the same core details.

Vague or missing detail is the most common way accident book entries fail to hold up later. "Fell over" tells an inspector or a solicitor almost nothing six months on. "Slipped on a wet floor near the kitchen fire exit at approximately 2:15pm, no wet floor sign displayed" is a record that actually protects the business as well as the employee.

GDPR: where older accident books fall down

Recording personal data about an injury is covered by GDPR, and this is the part most workplaces get wrong, not because they fail to record anything, but because of how they record it. The old style of accident book, a single bound notebook where every entry sits on the same page as the last, means anyone who opens it can read every other employee's injury history. That's a data protection problem, not just an untidy one.

The legal recording requirement itself satisfies GDPR's "legal obligation" basis for processing, so you don't need separate consent to log an injury. But you do still need to handle the data properly: store the book securely, limit who can see it, and use a format, tear-out or perforated pages, a confidential single-entry sheet, or a properly access-controlled digital system, so one person's entry isn't visible to the next person who has an accident. After the three-year retention period, personal data in older entries should be securely disposed of or redacted rather than left indefinitely.

Why accurate records matter beyond the paperwork

This is the part that connects directly to first aid training, and it's easy to miss if you only think of the accident book as a compliance box to tick. Resuscitation Council UK and St John Ambulance both emphasise accurate, timely documentation as part of good first aid practice, not as an afterthought once the immediate emergency is over. What treatment was given, when, and by whom, is exactly the kind of detail that matters if a casualty needs further care, if paramedics need a handover, or if the incident is reviewed afterwards to stop it happening again.

A first aider who's been properly trained understands this instinctively: treat the casualty first, then record what happened while it's still fresh, because a good record is part of the response, not paperwork bolted on after it. That's a large part of why hands-on, practical first aid training matters more than a certificate on a wall, it builds the habit of recording accurately under pressure, not just performing the physical steps correctly.

What happens if you don't keep one

Not keeping an accident book, or keeping one so poorly that entries are missing, vague or clearly written up after the fact, creates real exposure. If an employee later brings a personal injury claim, the absence of a contemporaneous record makes it far harder for an employer to demonstrate what actually happened, and courts and tribunals tend to view a well-kept record as more reliable evidence than memory alone, from either side. HSE can also ask to see accident records during an inspection, and gaps or inconsistencies are the kind of thing that turns a routine visit into a more detailed one.

None of this requires anything complicated. A properly kept accident book, filled in accurately and promptly, filed securely, and retained for the required period, is one of the cheapest and simplest pieces of legal protection a workplace can have in place.

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