Why retail advertising claims get challenged before your customers ever complain

Who's actually checking, and under what law

In the UK, the key body is the Advertising Standards Authority (ASA), which enforces the CAP Code (the UK Code of Non-broadcast Advertising). Since 2018, UK guidance has generally required that a "was" price be based on the product being offered at that price for a continuous period, commonly cited as at least 28 days in the preceding six months, before a discount claim is made. This closes the loophole of a fake "was" price used for one day just to justify a "sale."

The UK's Competition and Markets Authority (CMA) also has direct enforcement powers over misleading pricing under consumer protection law, and has actively investigated "drip pricing" (where the final price is higher than the advertised price due to hidden fees) and fake urgency claims ("only 2 left!").

In the EU, the relevant framework is the Unfair Commercial Practices Directive (UCPD) and, specifically for discounts, the Omnibus Directive (Directive 2019/2161), which came into force across member states from 2022. It requires that any price reduction announcement state the prior price, defined as the lowest price applied in at least the last 30 days before the reduction. This is stricter and more specific than older national rules, and it applies EU-wide, so a pan-European campaign cannot rely on the most lenient national interpretation.

In the US, the Federal Trade Commission (FTC) enforces Section 5 of the FTC Act against "unfair or deceptive acts or practices," and has specific Guides Against Deceptive Pricing that address fictitious "former price" claims. State attorneys general also actively pursue pricing cases; California and New York in particular have brought actions against retailers over inflated reference prices.

The practical implication: a retailer running the same "was/now" creative in London, Paris, and New York needs three separate compliance checks, not one.

What evidence has to exist before you launch

Pre-launch compliance is not a legal afterthought bolted onto a finished campaign. It is a gating step. Before a "was/now" or comparison claim goes live, marketing teams should be able to produce:

• Price history logs: dated records showing the product was sold at the "was" price for the required qualifying period (28 days UK, 30 days EU under Omnibus).
• Competitor price evidence: screenshots, scraped data, or third-party pricing feeds with timestamps, for any "lowest price" or comparison claim.
• Methodology notes: what was compared (same SKU, same pack size, same delivery terms), and when.
• Approval sign-off: a documented legal or compliance review, often via a claims substantiation form, before the creative is released to media buying.

A simple internal rule many retail compliance teams use: no substantiation file, no launch. This is deliberately blunt because marketing timelines create pressure to skip the check, and regulators do not accept "we were in a rush" as a defense.

A minimal substantiation record, in practice

This is not sophisticated technology. It is discipline: a repeatable checklist applied every time a price claim goes into an ad.

Why "we'll fix it if someone complains" doesn't work anymore

The old model of advertising compliance was reactive: run the ad, wait for a competitor or consumer to complain, respond if regulators follow up. That model has largely broken down for two reasons.

First, monitoring is now automated. Regulators, consumer groups, and even competitor legal teams use web scraping and price-tracking tools to flag suspicious "was" prices at scale, without waiting for a human complaint.

Second, penalties have grown teeth. Under the EU's Omnibus Directive, national authorities can levy fines up to 4% of the trader's annual turnover in the relevant member state(s) for the most serious, widespread infringements. In the UK, the CMA gained direct fining powers for consumer law breaches under the Digital Markets, Competition and Consumers Act 2024, moving away from a court-only enforcement model. These are meaningful enough that "wait and see" is no longer a defensible strategy for a marketing or legal team.

🎬 [VIDEO: "How the ASA regulates advertising in the UK" - youtube.com - search this title on the ASA's official YouTube channel for a short explainer on the complaint and pre-clearance process]

Building compliance into the campaign calendar, not after it

Practically, this means retail marketing teams need to shift claims substantiation earlier in the campaign timeline:

1. At briefing stage: any price, comparison, or guarantee claim gets flagged for legal review before creative is even built.

2. At creative development: copy is checked against the evidence file, not the other way around (evidence should not be retrofitted to match aggressive copy).

3. Before media buy: a final sign-off gate, often called a claims clearance, confirms the substantiation file is complete.

4. Post-launch monitoring: for guarantees like price-matching, ongoing monitoring is needed because the claim has to remain true for the campaign's duration, not just true on day one.

This is the same logic used in regulated sectors like pharma or financial services, adapted to retail's much faster campaign cadence. The UK government's own guidance on pricing practices for traders is a useful free reference for marketing teams building this checklist.

Key Takeaways

• "Was/now" pricing, lowest-price guarantees, and comparison ads are the three claim types most likely to be checked, because they are specific, quantifiable, and easy to disprove.
• The UK (ASA, CMA) and EU (Omnibus Directive) both now require a "was" price to reflect a genuine prior price held for a minimum period (28 days UK, 30 days EU), not a price briefly inflated before a "discount."
• The US FTC and state attorneys general enforce similar deceptive pricing rules under Section 5 of the FTC Act, meaning global campaigns need market-specific compliance checks, not one global standard.
• Evidence (price history logs, competitor data, comparison methodology) must exist before launch, not be assembled defensively after a complaint.
• Regulatory monitoring is now largely automated and penalties have increased (up to 4% of turnover under EU Omnibus for serious breaches), making proactive pre-launch compliance a business necessity, not a legal courtesy.