7 Restaurant Allergen Mistakes That Cause Serious Reactions

Four years after Natasha’s Law came into force, we’re still handling nut allergy claims that could have been prevented. Not because the law doesn’t work. Because people implementing it don’t understand what actually causes reactions.

After 18 years handling allergy claims, we’ve seen these same seven mistakes repeated across chains and independents, cafés and restaurants, throughout England and Wales. Different venues. Same failures.

This isn’t a lecture. This is what we see when we review the evidence after someone ends up in A&E. If you work in hospitality, this is what to watch for. If you’ve had a reaction, this is probably what happened.

1“A Little Bit Won’t Hurt Them”

What we hear: “It’s only a trace amount.” “The nuts are just a garnish.” “Surely that’s not enough to cause a reaction.”

The reality: For someone with a severe nut allergy, even microscopic traces can trigger anaphylaxis. We’ve handled claims where the client reacted to a cake decoration that touched nuts briefly before being placed on their dessert. A “tiny bit” can mean an EpiPen, an ambulance, and months of anxiety about eating out again.

What should happen: If the customer has disclosed a nut allergy, the answer is zero nuts. Not “a little bit.” Not “probably fine.” Zero. Natasha’s Law gave you the tools to check ingredients. Owen’s Law will require you to proactively confirm. But right now, today, just take “I’m allergic to nuts” as seriously as you’d take “I’m allergic to penicillin” in a hospital.

2“Cross-Contamination Isn’t My Problem”

What happens: The dish itself is nut-free. But it’s prepared on the same surface as something with nuts. Or stirred with the same spoon. Or touched by hands that just handled nuts. The customer has a reaction. The restaurant denies responsibility because “we didn’t add nuts.”

The legal reality: Under the Food Information Regulations 2014, you have a legal duty to prevent cross-contamination when you’ve been told about an allergy. “We can’t guarantee” isn’t a defence—it’s an admission that your processes aren’t safe for allergy sufferers. If you’ve been informed of an allergy and serve food anyway, cross-contamination becomes your responsibility, not theirs.

What should happen: Separate preparation area. Clean utensils. Washed hands. Fresh gloves. It takes 90 seconds. Or you can spend months dealing with a compensation claim and Environmental Health investigation. Your choice.

3“The Chef Will Remember the Allergy”

The scenario: Customer tells the waiter about their nut allergy. Waiter tells the chef verbally. Chef acknowledges. Twenty minutes and seven orders later, the dish goes out with nuts because the chef forgot or another chef plated it up.

This is the single most common failure pattern we see in nut allergy claims. Busy service. Verbal communication only. Human memory under pressure. Recipe for disaster.

What should happen: Written ticket. Every time. “Table 12 – NUT ALLERGY” in large letters on the order. When Owen’s Law comes in, this kind of documentation will move from “best practice” to “legal requirement.” Get ahead of it. Your EPOS system probably already has an allergy alert function. Use it.

4“May Contain Nuts” Means It’s Probably Fine

The misunderstanding: Staff see “may contain nuts” on a product and think it’s a precautionary warning that can be ignored if the customer isn’t too sensitive. “It doesn’t actually have nuts, it just might.”

What it actually means: The manufacturer can’t guarantee the product is nut-free because of shared equipment or manufacturing lines. For someone with a severe allergy, “may contain” is a massive red flag, not a minor disclaimer. If they’ve told you about their allergy and you serve them something labelled “may contain nuts,” you’ve failed in your duty of care.

What should happen: If it says “may contain nuts” and the customer has a nut allergy, don’t serve it. Find an alternative. It’s that simple. Natasha’s Law requires you to know what’s in your food. Staff training should include reading and understanding allergen warnings properly.

5“They’re Just Being Fussy”

The attitude: Some staff assume customers claiming allergies are exaggerating or following a trend. This casual dismissiveness costs people their health—and businesses their reputation.

We’ve heard accounts from clients about staff who seemed sceptical when taking allergy information, or who treated their specific, serious warning as just another dietary preference rather than critical safety information. The underlying problem is the same: not taking the disclosure seriously enough.

When someone has a severe allergic reaction, the earlier dismissive attitude becomes very clear in hindsight. The customer who seemed “fine” was actually managing a life-threatening condition carefully—until your establishment failed to take it seriously.

What should happen: Take every allergy disclosure as potentially life-threatening. Because you can’t tell by looking at someone how severe their allergy is. The person who seems perfectly fine might carry two EpiPens because they’ve nearly died twice before. Treat every allergy warning with the seriousness it deserves. Owen’s Law will mandate this in training. Don’t wait for the law to tell you something this basic.

6“It’s Not a Restaurant Problem, It’s a Supplier Problem”

The blame-shift: When something goes wrong, some businesses immediately point to their suppliers. “We trusted the supplier’s labelling.” “They told us it was nut-free.” “It’s not our fault if they got it wrong.”

The legal position: You’re the one who served the food. Under the Food Safety Act 1990 and the Food Information Regulations 2014, the legal responsibility sits with you—the food business operator—not just your supplier. You can’t outsource legal liability by blaming your supply chain.

What should happen: Vet your suppliers properly. Get written allergen information. Keep records. If you can’t verify that a product is safe for someone with a disclosed allergy, don’t serve it. Yes, you might have a claim against your supplier afterwards. But you’re still legally responsible to the customer who ended up in A&E at your premises after eating your food.

7“I Told Them, They Should Know”

The scenario: Customer asks if a dish contains nuts. Server says “I think there might be nuts, I’m not sure, better check the menu.” Customer interprets this as “probably safe” or “only minor traces.” Server interprets it as “I warned them.” Customer has a reaction. Business claims they gave a warning.

This is where clear communication becomes critical. Vague warnings aren’t enough. “There might be” isn’t useful safety information. The customer needs either “Yes, this definitely contains nuts, don’t order it” or “No, this is completely nut-free and we’ve confirmed it with the kitchen.”

What we see in claims: The customer thought they were being cautious by asking. The server thought they gave adequate warning. The kitchen wasn’t consulted at all. Everyone made assumptions. Someone ended up in hospital.

What should happen: If you’re not certain, find out. Don’t guess. Don’t hedge. Get a definitive answer from someone who knows—usually the kitchen or a manager who has access to full allergen information. Owen’s Law will make this kind of clear, proactive communication mandatory. The law’s catching up with what should already be obvious: when someone asks about allergens, they need a real answer.

What This Means for Customers Who’ve Had Reactions

If you’re reading this because you’ve had an allergic reaction at a restaurant, these seven mistakes probably explain what went wrong. The question isn’t whether the law protects you—it does, clearly, under both Natasha’s Law and the Food Information Regulations 2014. The question is whether you have enough evidence to prove which mistake happened.

That’s where experience matters. We’ve handled hundreds of allergy claims since 2007. We know which evidence questions to ask, which defences restaurants try to use, and how to prove negligence even when the food’s been thrown away or the staff “can’t remember.”

If you warned them about your allergy and they served you nuts anyway, you’ve got a claim. Whether it’s Mistake 2 (cross-contamination), Mistake 3 (forgot to tell kitchen), or any of the others—the underlying failure is the same. They had a legal duty to keep you safe. They didn’t.

Important: You have three years from the date of the reaction to start your claim. Don’t wait until evidence disappears or memories fade. The sooner you contact us, the stronger your claim becomes.