Because there's no number to hit, "adequate and appropriate" becomes a judgement you're expected to make and, if it ever matters, to defend. The assessment doesn't have to be a formal written document by law. But the HSE notes that employers may need to justify the level of provision they've settled on.
That's the bit the office head-count misses. "We've got one bloke who did a course in 2019" isn't a justification. It's a shrug with a date on it. If someone gets hurt, or an inspector asks, or your insurer wants to see your reasoning, a shrug is not where you want to be standing.
A defensible answer looks different. It shows you actually thought about your workplace, weighed the right factors, and reached a provision level that fits. The number matters less than the reasoning behind it.
What an honest assessment actually weighs
This is where the head-count falls apart, because the number of people in the building is only one input, and not the most important one. A proper first aid needs assessment runs through a set of factors that most "quick decisions" never touch:
The nature of the work and its hazards. A clerical office and a workshop with machinery are not the same risk, and they shouldn't land on the same provision.
Headcount — but as a starting point, not the answer. Numbers feed in. They don't decide.
The spread and accessibility of your site. One building or six? Easy to move between, or not?
Shift patterns and out-of-hours cover. Provision has to hold when the people who'd normally provide it are absent — including holidays and sickness, not just the night shift.
Lone and remote workers. The people most exposed are often the ones furthest from help.
Distance to emergency services. How long until an ambulance actually arrives changes what you need on site.
Each of these can move your answer. Work through them properly and you tend to land somewhere different from where the head-count guess would have put you — sometimes more provision, sometimes a different kind, occasionally less than you feared but with a reason attached.
The gap between deciding and recording
Here's the practical problem. Even people who think it through rarely write it down. The reasoning happens in someone's head on a Tuesday and then evaporates. Six months later nobody can reconstruct why the business has the cover it has — which means there's nothing to defend, review, or hand to anyone who asks.
That's the gap worth closing. Not "do the assessment" — most people will at least intend to. The missing piece is doing it in a structure that captures what you decided and why, in a form you can keep, reuse when the business changes, and produce when it matters.
Closing it without starting from a blank page
You can absolutely do this yourself from the HSE guidance. It's all public. The reason most businesses don't isn't cost or difficulty — it's the blank page, and the quiet uncertainty about whether you've covered the right factors in the right way.
That's the specific problem I built the First Aid Needs Assessment Tool to solve. It walks you through the factors above in order, prompts you for the situations people forget — lone workers, multiple buildings, shift cover, low-headcount sites — and leaves you with a finished record of your reasoning: ready for the file, ready for an inspector, reusable the next time your business changes shape.
It doesn't replace your judgement. The law makes that judgement yours, and it should stay there. What the tool does is make sure you've structured it properly and written it down — so the next time someone asks how many first aiders you need, you have an answer instead of a guess.
Aligned with UK HSE guidance. This article is general information, not specific legal advice for your situation.
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