Alex is Sprintlaw's co-founder and principal lawyer. Alex previously worked at a top-tier firm as a lawyer specialising in technology and media contracts, and founded a digital agency which he sold in 2015.
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With the rise of social media, influencer marketing and online reviews have become powerful tools for building trust and driving sales. But for UK businesses, the line between smart marketing and unlawful deception can be thin – especially when compensation or incentives are involved.
Understanding where that line lies is essential. The UK has strict rules to ensure transparency in advertising and protect consumers from misleading practices. Staying compliant keeps you safe from enforcement action, fines, and reputational harm, while helping you earn genuine trust from customers.
This guide explains the difference between legitimate influencer marketing and illegal paid reviews, what the ASA and CMA expect, and how to keep your campaigns compliant.
Influencer Marketing vs Paid Reviews
What Is Influencer Marketing?
Influencer marketing is when a brand collaborates with an influencer to promote a product or service, typically in return for payment or another benefit (like a free product). The key legal requirement is transparency – the influencer must clearly disclose when content is paid or sponsored. When disclosed correctly (for example, using “#ad” or “Paid Partnership with ”), influencer marketing is both legal and highly effective. The Advertising Standards Authority (ASA) and the Competition and Markets Authority (CMA) support influencer partnerships, provided they’re transparent and not misleading.What Are Unlawful Paid Reviews?
Paid reviews become unlawful when they are misleading or undisclosed. It’s illegal in the UK to pay for, encourage, or create fake or undisclosed incentivised reviews.- Fake reviews – Reviews written by people who haven’t genuinely used the product or are misrepresenting their experience.
- Undisclosed incentivised reviews – When customers are offered a benefit (like a discount or freebie) in exchange for a positive review, without that incentive being clearly disclosed.
- Manipulated testimonials – Editing or selectively posting reviews to mislead consumers.
UK Legal Framework
Advertising Standards Authority (ASA)
The ASA enforces the CAP Code (UK Code of Non-broadcast Advertising). It requires that all ads and sponsored content must be “obviously identifiable as such.” To comply, whenever there’s a material connection between the business and influencer – such as payment, free products, or affiliate links – this must be disclosed upfront. Acceptable disclosure examples include:- Using “#ad”, “#sponsored”, or “Paid Partnership with ” prominently in the post.
- Ensuring disclosures are clear and visible before users engage with the content (not buried or hidden).
Competition and Markets Authority (CMA)
The CMA focuses on protecting consumers under the Consumer Protection from Unfair Trading Regulations 2008 (CPRs). Under these regulations, it is illegal to:- Post or commission fake reviews.
- Pay for or incentivise reviews without disclosing the commercial relationship.
Why Disclosure Matters
Transparency is at the heart of UK consumer law. Consumers must know when content has been paid for, or when a reviewer has received a reward. Honest disclosure helps level the playing field and builds long-term trust.- Consumers rely on truthful reviews to make purchasing decisions.
- Hidden incentives or fake reviews distort competition.
- Brands that disclose openly are viewed as credible and trustworthy.
Risks Of Non-Compliance
- ASA enforcement – Mandatory removal or correction of posts and public naming on the ASA website.
- CMA or Trading Standards action – Investigations, legal undertakings, or court orders.
- Fines and criminal liability – For serious or repeat breaches of the CPRs.
- Reputational damage – Loss of trust from customers and influencers alike.
Examples: What’s Allowed vs What Isn’t
Lawful Influencer Marketing
- Sending a free product to an influencer who tags the post with “#ad” or “Gifted by ”.
- Paying for a sponsored YouTube review clearly labelled as a paid partnership.
- Affiliate promotions disclosed with “I may earn a commission if you buy through my link.”
Unlawful Paid Reviews
- Paying someone to post a fake review under a false identity.
- Offering discounts for positive reviews without disclosing the incentive.
- Deleting or hiding negative reviews to mislead consumers.
How To Stay Compliant
1. Make Disclosure Mandatory
Any influencer or partner promoting your brand must disclose the relationship clearly. Include disclosure terms in every influencer contract and monitor compliance.2. Never Create or Buy Fake Reviews
Do not fabricate or purchase reviews. Avoid using agencies or bots that generate fake testimonials – these violate the law and destroy credibility.3. Manage Incentives Properly
Offering incentives to leave reviews is allowed only if the incentive is fully disclosed in the review itself. Consumers must understand the context of the review.4. Audit Your Reviews Regularly
Implement regular audits to identify fake or misleading reviews. Encourage genuine customer feedback and correct issues promptly.5. Use Clear Influencer Contracts
Set out compliance obligations in your influencer agreements, including mandatory disclosure and content review clauses. Outline penalties for non-disclosure.6. Stay Up To Date
Check the ASA and CMA websites for the latest guidance. Regulations evolve as social media platforms and marketing methods change.7. Promote Honest Review Culture
Encourage balanced feedback – both positive and negative. Consumers are more likely to trust authentic reviews than a perfect five-star profile.Key Takeaways
- Influencer marketing is legal if compensation or gifts are clearly disclosed.
- Fake or undisclosed paid reviews are illegal under the CPRs.
- Transparency builds trust and protects your business from ASA or CMA penalties.
- Include disclosure clauses in influencer agreements and monitor compliance.
- Regularly review and audit your online testimonials for accuracy and authenticity.
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