Which AI marketing mistakes can a UK regulator fine you for?

Short answer: Since 6 April 2025 the Digital Markets, Competition and Consumers Act 2024 lets the CMA fine a business directly, up to 10% of global turnover, without going to court. The costly AI marketing mistakes in the UK are therefore no longer weak copy. They are habits AI makes cheap and the law now bans outright: reviews an AI wrote, unlabelled incentivised reviews, urgency copy that is not true, headline prices missing mandatory fees, and AI images that invent a maker, customer or result.

Most lists of AI marketing mistakes treat every error as equal: generic copy, too many tools, no strategy. In the UK, that has been wrong since April 2025. A dull blog post costs you only attention. A fake testimonial, or a countdown timer that never really counts down, can now bring a fine.

Most small businesses are not a priority for the CMA, and we will say so plainly. But the ASA and Google act on small businesses all the time, and the fixes below are cheap. So sort your mistakes by who can act on them, fix the fineable ones first, then deal with the ones that only waste money. This is general information, not legal advice. It sits under our guide to AI marketing for UK small businesses.

What changed in April 2025, and why should a five-person business care?

The consumer provisions of the Digital Markets, Competition and Consumers Act 2024 (the DMCC Act) came into force on 6 April 2025. Before that, the CMA had to take a business to court to enforce consumer law. Now it can run its own administrative process: it can issue infringement notices, fine a business up to 10% of annual global turnover, and order it to compensate consumers.

The size of the fine is not the main point for a small firm. The Act also put specific practices on a banned list. Schedule 20 lists 32 practices that are always unfair, so the question is no longer “would a judge think this was misleading?” but “is this on the list?”.

Every banned practice below is something a language model will produce on request, in seconds. The tool does not know the rules. It writes what you ask for.

Can an AI write your reviews, or can you pay for them?

Schedule 20 bans submitting or commissioning fake consumer reviews. A fake review is one that claims to be, but is not, based on a genuine experience, whether it is positive or negative. Selling reviews generated by software is also treated as a prohibited service.

Our reading is that an AI-written review of a purchase nobody made is a fake review, because it is not based on a genuine experience. That covers asking a chatbot for testimonials for a new site while you wait for real customers, and commissioning someone else to do it.

Two other rules sit next to that one. Incentivised reviews are allowed only if prominently and clearly labelled as incentivised. And publishing must not mislead: hiding the negative reviews, or showing only the positive ones, is banned as well.

There is a Google difference worth knowing. Google’s review policy bans offering incentives for Google reviews at all. So a discount that is fine, if labelled, on your own site is a problem on your Google Business Profile.

The fix is unglamorous: ask real customers straight after the job, with a link. Label any incentive wherever the review appears, and never offer one for a Google review. Show the reviews you get, including the poor ones. Use AI to draft the request message or your reply to a review, never the review itself.

The CMA opened five consumer law investigations into fake and misleading reviews on 27 March 2026: Autotrader, Feefo, Dignity, Just Eat and Pasta Evangelists. They are investigations, not findings, and we say nothing here about how they will end. They do show where the regulator is looking.

Is your urgency copy true?

Ask an AI tool for a sales email and it can add urgency by itself. Schedule 20 lists, among its always-unfair practices, falsely stating that a product, or the terms it is offered on, will only be available for a limited time.

The best illustration is Emma Sleep. On 22 May 2026 the High Court made an order against the company in a CMA case brought under the older Consumer Protection from Unfair Trading Regulations 2008. The case started before the DMCC Act, so it was not decided under the new fining powers. The findings were that “time-limited” discounts in fact ran continuously, that countdown timers ran to zero with no real change in the offer, and that “high demand” messages could be triggered by as few as two site visits. Emma accepted the findings and gave undertakings.

We are not saying Emma used AI. The case shows what false urgency looks like, and an AI tool will write “ends Sunday” whether or not the offer ends on Sunday.

The test for every urgency line is simple: does the offer really end then, and does it really change afterwards? Is the stock or demand claim driven by something real? If not, delete the line. Invented deadlines are on the banned list.

Does the headline price include every mandatory fee?

Drip pricing has been banned since 6 April 2025. The headline price must include all mandatory fees and charges the customer will have to pay. If a £40 service always carries a £5 booking fee, £40 is not the price.

AI causes this in an ordinary way. You paste a price list into a tool and ask for an ad. It may pick the headline number and move the fee into a footnote, because that reads better.

Optional extras are different. Gift wrapping or express delivery the customer can choose not to buy are not mandatory fees, and can be priced separately. Compare the number in every AI-drafted ad and landing page with the number at your final checkout step. If they differ by anything the customer cannot avoid, change the copy. Our guide to digital advertising for UK small businesses covers price claims in more depth.

Can an AI invent a maker, a customer or a result?

It can, and it will if the prompt invites it. The clearest UK example is a ruling by the ASA against Henry’s Boots, published on 9 April 2025. The ads claimed the boots were handmade by “Henry” in a workshop that was closing down. The workshop images were AI-generated, and Henry was not a real person. The ASA upheld all four complaints. The advertiser did not respond to the ASA.

The ASA’s guidance on AI and deepfakes, published on 18 June 2026, makes the wider point. The CAP Code is media-neutral. Ads created with AI face the same rules on misleadingness, offence and social responsibility as any other ad, and advertisers stay responsible for what AI tools and automated placement produce.

Watch for four inventions in particular: a maker or founder who does not exist, an AI portrait with a first name and a quote presented as a real client, a before-and-after image of work you have not done, and a workshop or shop that is a render. AI images are fine as illustration when nobody could take them for evidence. They become a problem when the image is the claim. If a person, place or result is not real, say so plainly or use a real photograph.

A hypothetical example: an independent homeware shop in Bath

This is an invented example, and it claims no results. Picture a small homeware shop in Bath with an online store and two staff. The owner asks an AI tool for product pages and a “founder story”. Read against the list above, four things are wrong. The product pages carry a “Sale ends Friday” banner on a discount that has no end date. The headline price leaves out a mandatory £4.95 handling charge that appears only at checkout. Three “customer reviews” have been added to a new product page, written by the tool. And the founder story describes a grandmother’s workshop in the Cotswolds that does not exist.

None of it is malicious. The owner asked for warm copy and got it. The fix takes an afternoon: remove the banner or set a real end date, put the handling charge into the headline price, delete the three reviews and email recent buyers for real ones, and rewrite the founder story around the actual owner. The shop keeps the AI-drafted product descriptions once a person has checked them, because nothing about them is banned.

Which regulator is actually likely to reach a small business?

Sort the mistakes by who can act on them, because the risk is not spread evenly.

Who	What they do	Likelihood for a small business
CMA	Can fine directly, up to 10% of global turnover, and order compensation	Low. The investigations it has announced involve larger, well-known names
ASA	Rules on complaints about any advertiser, whatever its size	Real. A competitor or a member of the public can complain about anyone
Google	Removes reviews, suspends listings and demotes spam at scale	High. It acts automatically and constantly
ICO	Enforces UK GDPR and PECR	Depends on your data and messages

A five-person business is unlikely to be the CMA’s next headline. That is a poor reason to keep the habits: the ASA acts on complaints, and a rival with a grievance is enough. Google needs no complaint at all.

The ICO is a separate track. Outbound marketing messages and calls have their own rules, covered in our guides to AI lead generation in the UK and the best AI lead generation tools for UK businesses.

The mistakes that cost money but not fines

Once the banned habits are fixed, two mistakes remain that cost you more slowly. Our pillar guide covers the wider list, so this section is short.

The first is scaled thin content. Google’s March 2024 spam policy on scaled content abuse treats generating many pages mainly to manipulate search rankings as spam, however they were created, including with generative AI. Accurate, useful AI-assisted content is not the target. Our guides to local SEO for UK small businesses and SEO, AEO and GEO in the UK explain what earns visibility instead.

The second is unreviewed output. In the Bath example, every problem reached the page because nobody read the copy against the facts. If you run automated content or sequences, our guide to marketing automation for UK small businesses covers where to put the human check.

A check before you publish

Run this before anything AI-drafted goes live. It takes a few minutes.

• Reviews. Is every review and testimonial from a real customer who bought or used the product? Are incentivised ones labelled, and is there no incentive on Google?
• Urgency. Does every deadline, countdown, “only X left” and “high demand” line match something real that changes when it ends?
• Price. Does the headline price include every fee the customer must pay?
• People and places. Is every named maker, customer, workshop and result real, or clearly marked as an illustration?
• Owner. Has a named person read the final version against the facts?

If something fails, fix it or cut it. Setting up a review step for your own tools is part of our AI automation work.

Frequently asked questions

Is an AI-written testimonial a fake review under UK law? In our reading, yes, if it claims to come from a customer who never bought or used the product. The DMCC Act bans fake consumer reviews, meaning reviews that claim to be based on a genuine experience but are not. Commissioning one is banned as well as posting it. This is general information, not legal advice.

Can I give customers a discount for leaving a review? Under the DMCC Act, an incentivised review is allowed only if it is prominently and clearly labelled as incentivised. Google is stricter: its policy bans offering incentives for Google reviews at all, so a labelled incentive is still a problem there. Ask real customers, label any incentive, and never offer one for a Google review.

Is a countdown timer on my website illegal? Not in itself. A timer is a problem when it is not true: a sale that is not really ending, or a clock that resets to the same offer. Falsely stating that a product or its terms will only be available for a limited time is on the list of practices that are always unfair.

Can I add a booking or handling fee at checkout? Not if every customer has to pay it. Drip pricing, where mandatory fees appear only later in the journey, has been banned since 6 April 2025, so a compulsory booking or handling fee belongs in the headline price. Optional extras, such as gift wrapping, are not mandatory fees and can be shown separately.

Will the CMA come after a small business over AI content? Unlikely as a first target. The investigations it has announced so far involve larger, well-known names. But the rules apply to every business, and the ASA and Google act on small ones all the time. The cheap fixes are worth making whichever regulator you think is watching.

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