Best, leading, number one: what a UK brand needs before it says it

CAP's advice treats an unqualified superlative as a claim that the business is superior to all competitors, so the rules on comparisons with identifiable competitors apply, and the claim needs documentary evidence under rule 3.7. The interpretation depends on product and context, and the evidence has to match the interpretation.

Number one, best selling and leading are generally read as objective best selling claims, particularly when unqualified, and they call for market share or unit sales data. The AA's UK's number one breakdown service provider was ruled misleading in 2022 because the AA lacked competitors' membership figures for a like for like comparison. Rental Republic's number one holiday website on the planet failed in the same year for lack of global turnover evidence.

The ASA asks what consumers would understand, then checks the data against that. O2's voted Britain's best for coverage beside an awards logo read as a market wide comparison expected to rest on objective data; because the award rested on a broad consumer perception survey in which people rated only their own provider, it was ruled misleading in 2021. Best price, best available tickets, the best alarm technology on the market and the UK's best value mobile have all failed for want of evidence.

Nuance offers no escape. Lyma's world's most powerful beauty device was read as a claim about effectiveness rather than power output, and the evidence had to match that reading (2024). CAP is explicit that self reported consumer data and awards fall short where objective substantiation is expected.

Because an objective superlative compares you with every competitor, it must also be verifiable: the ad sets out the basis or signposts where the audience can check it, and if checking needs expertise, an independent person must be able to do it. Information behind a paywall has been ruled insufficient (Procter and Gamble, 2020).

Rule 3.2 allows obvious exaggeration that the average consumer is unlikely to take literally, provided it misleads nobody. The ASA read the original and the best since 2004 on a pillowcase as subjective opinion (Slipsilk, 2020), yet read Sky's the perfect network as an objective claim about network performance (2022). The difference is whether the word has a checkable meaning in context, and perfect, next to a network, does.

Best is the most common word in service marketing and the least believed, which is why the ASA treats it as a claim and customers treat it as noise. The specific fact behind it, the number of years, the number of clients, the one thing the business does that others decline to do, is both easier to defend and harder to forget.

Positioning is the choice of which specific thing to be known for. A business that has made that choice rarely needs a superlative; a business that reaches for one usually has yet to make it.