Retail Media Networks in the UK: The Advertising Opportunity Brands Are Missing

Britain's major retailers are quietly building some of the most valuable advertising businesses in the country — and a significant portion of UK brands have yet to notice. Retail media networks, which allow advertisers to buy placements powered by a retailer's own shopper data, are forecast to account for more than £1 billion in UK digital ad spend this year, according to figures tracked by the IAB UK and cited in recent coverage by Marketing Week. Yet conversations with buyers and strategists suggest that many brands, particularly those outside the top tier of FMCG suppliers, are still treating the channel as an afterthought.

The question is no longer whether retail media deserves a seat at the planning table. It is whether brands can afford to keep leaving that seat empty.

What UK Retail Media Networks Actually Offer

At their core, retail media networks are advertising platforms built on top of a retailer's owned properties and, crucially, its first-party customer data. Tesco's Dunnhumby-powered Tesco Media and Insight Platform, Sainsbury's Nectar360, and the increasingly sophisticated offering from Boots Media Group each give brands the ability to reach shoppers at the point of highest intent — when they are actively browsing or buying — using behavioural data derived from millions of real transactions.

The channel spans a widening range of formats. Sponsored product listings and banner placements on retailer websites remain the backbone, but in-store digital screens, off-site programmatic targeting using retailer audiences, and even connected television activations are now part of the proposition being offered to suppliers. As reported by The Grocer, investment in these platforms by top grocery suppliers has grown substantially year-on-year as the networks professionalise their measurement and reporting capabilities.

What distinguishes these environments from Google or Meta is the closed loop. A brand can serve an ad to a shopper who previously purchased a rival product, then track whether that shopper switched — not through modelled attribution, but through actual basket data. For any marketer wrestling with proving return on investment, that is a genuinely differentiated offer.

The gradual deprecation of third-party cookies has reshuffled the hierarchy of digital advertising, and retail media sits near the top of the new order. While much of the open web now struggles to deliver meaningful audience targeting, retailers hold something increasingly rare: consented, behavioural, first-party data at scale.

Nectar alone has more than 18 million active cardholders in the UK. Tesco Clubcard figures are comparable. The loyalty infrastructure that UK grocers spent decades building, largely as a retention and pricing tool, has matured into an advertising asset of considerable commercial value. For brands that relied on cookie-based prospecting to find new customers, retail media audiences offer a compliant and arguably more accurate alternative.

Agencies with strong digital practices, including consultancies such as CM Beyer, have been advising clients to audit their retail media exposure as part of broader post-cookie planning — recognising that the shift is structural rather than cyclical.

Why Brands Are Still Under-Invested

Despite the clear structural tailwinds, retail media budgets at many mid-sized UK brands remain modest. Several factors explain the gap.

The first is organisational. Retail media has historically sat in the trade marketing budget rather than the brand or media budget, meaning it often competes for funding against price promotions and listing fees rather than against digital display or paid social. This siloed thinking depresses investment by placing retail media in the wrong commercial conversation.

The second is complexity. Each major retailer operates a distinct platform with its own taxonomy, measurement framework, and minimum spend requirements. A brand activating across Tesco, Sainsbury's, Ocado, and Amazon simultaneously is effectively managing four separate media businesses, each with its own account team and reporting logic. For a marketing department without dedicated retail media resource, this overhead is a genuine deterrent.

The third is perception. Retail media has long been positioned as a lower-funnel, conversion-focused tool — the digital equivalent of an end-of-aisle display. Brands with strong awareness objectives have been slow to recognise that the same first-party audiences powering sponsored listings can now be deployed in video and display formats across the open web, substantially extending the channel's strategic range.

The Emerging Landscape Beyond Grocery

Retail media is no longer a grocery-centric story. Non-food retailers are accelerating investment in their own platforms. Currys has developed an advertising proposition built on its database of electronics purchasers. B&Q parent Kingfisher has signalled its intent to monetise its home improvement audience. In the fashion and beauty space, ASOS and Boots have been active for several years, while newer entrants including Very Group are formalising their offer.

The Advertising Association has highlighted retail media as one of the structural growth drivers in UK advertising, noting that the combination of first-party data, commerce intent, and closed-loop measurement makes these environments attractive to a broadening range of category advertisers — not merely those selling products through the retailer in question.

Brands in financial services, travel, and automotive have begun testing retail media placements, recognising that being present when a consumer is in a transactional mindset has value regardless of whether the product category is on the shelf.

Getting the Strategy Right

For brands approaching retail media seriously for the first time, a few principles consistently separate effective activations from wasted spend.

Start with measurement architecture before the first pound is committed. Without clear baseline data and agreed attribution methodology, it is impossible to evaluate performance or make the case for scaling budgets. Retailers have every incentive to show strong in-platform metrics; brand-side discipline in defining what success actually looks like is essential.

Resist the temptation to treat retail media as purely promotional. The same audiences that convert on a sponsored listing can be reached at earlier stages of the purchase journey through off-site and video formats. Brands that integrate retail media into their full-funnel planning, rather than quarantining it in a trade budget, consistently extract more value from the channel.

Finally, invest in the supplier relationships. The UK's major retail media networks are still maturing, and brands that engage proactively — sharing category insight, co-developing audience strategies, participating in beta formats — tend to secure better positioning, better data access, and more attentive account management than those treating the relationship as purely transactional.

Retail media will not replace brand advertising, digital search, or paid social. But as a channel that uniquely combines purchase intent, first-party data, and measurable commercial outcomes, it has earned a more prominent role in the UK media mix than most brand budgets currently reflect. The brands that move decisively now are likely to find the early mover advantage more durable than it first appears.