Retail media is the fastest-growing corner of digital advertising, and if you sell products in the UK, it's probably already affecting your business — whether you're using it or competing against someone who is. In short: retailers are selling advertising on their own websites, apps, and stores, and brands are paying for it because it reaches shoppers at the exact moment they're ready to buy.
This guide explains what retail media and retail media networks (RMNs) are, why they've exploded, how they work in practice, and what UK brands and retailers should actually do about them.
What is retail media?
Retail media is advertising placed within a retailer's own ecosystem: sponsored product listings on a supermarket's website, banner ads in a DIY retailer's app, digital screens in-store, or even ads on the retailer's delivery vans. The retailer sells the ad space; the brand pays to appear in front of the retailer's shoppers.
A retail media network (RMN) is the organised business behind this — the technology, sales team, and measurement framework a retailer uses to sell and deliver that advertising at scale. Tesco, Sainsbury's, Boots, and Argos all run significant retail media operations in the UK, alongside global players like Amazon.
Why does this matter? Because of first-party data. Retailers know what their customers actually buy — not just what they browse. In a world where third-party cookies are disappearing and privacy rules are tightening, that purchase data is gold dust for advertisers. A brand advertising dishwasher tablets can target people who actually buy dishwasher tablets, and then measure whether the ad drove a sale. That closed loop — ad to purchase, measured on real transactions — is what makes retail media so powerful.
Why retail media is growing so fast
Several forces are converging:
- The cookie crumbles. Third-party cookies and mobile identifiers are fading, making traditional audience targeting harder. Retailers' first-party purchase data doesn't depend on any of that. Our guide to alternatives to third-party cookies covers the wider picture.
- Retailers want the margin. Grocery and general retail run on thin margins; advertising is high-margin. Retail media turns a cost centre (the website) into a profit centre.
- Brands want measurable sales. Retail media connects ad spend directly to transactions — the attribution that brand advertising has always struggled to prove.
- Ecommerce keeps growing. More shopping happens on retailer sites and apps, which means more ad inventory where purchase intent is highest.
The three types of retail media
On-site: sponsored listings and display
Ads within the retailer's website or app — sponsored products in search results, homepage banners, category page placements. This is the biggest slice of retail media spend. It works because intent is highest: someone searching for "running shoes" on a sports retailer's site is ready to buy running shoes. For brands, the play is part media, part merchandising — visibility on the digital shelf.
Off-site: the retailer's data, elsewhere
Retailers extend their audiences beyond their own properties: targeting the retailer's shopper segments on the open web, social platforms, or connected TV. The creative runs elsewhere, but the targeting and measurement use the retailer's purchase data. Useful for reaching shoppers between visits and for upper-funnel brand building with transaction-level measurement.
In-store: the physical shelf goes digital
Digital screens at shelf edge, in-aisle displays, audio ads, and smart trolleys. In-store retail media is earlier-stage in the UK than on-site, but it's growing as retailers digitise the physical shop. For FMCG brands, influencing the in-store decision — still the majority of grocery purchases — is the prize.
How UK brands can get started
Start where you already sell
If your products are stocked by a retailer with an RMN, start there. You already have the commercial relationship, and the retailer's media team will help you spend (that's their job). Begin with sponsored product ads on your key search terms, measure the sales lift carefully, and expand to display and off-site once the basics work.
Treat it as trade marketing, not just media
Retail media sits between your media agency and your sales team — and that's where many brands fumble. Budgets, measurement, and accountability often fall between departments. The brands winning at retail media treat it as a joint commercial investment with the retailer, with shared targets on sales growth, not just media metrics.
Demand real measurement
The promise of retail media is closed-loop measurement: this ad drove these sales. Hold networks to it. Ask for incrementality — did the ad create new sales, or just capture sales that would have happened anyway? Insist on transparent reporting and compare return on ad spend across networks rather than taking each network's own numbers at face value.
Don't ignore the long tail
The big UK RMNs get the attention, but smaller specialist retailers run effective networks too — pet, baby, beauty, DIY. If your category has a dominant specialist retailer, their media offering may deliver better targeting and lower costs than the giants.
What if you're the retailer?
Building an RMN is a serious undertaking: ad tech, sales capability, data infrastructure, and measurement that advertisers trust. But for retailers with meaningful traffic and valuable purchase data, it's among the highest-margin revenue streams available. Start with on-site sponsored listings (simplest to operate), prove the model with a few brand partners, and expand from there. Honest advice: don't launch until your measurement is credible — advertisers who can't trust the numbers won't come back.
Retail media and your wider marketing
Retail media doesn't replace your other marketing — it changes the mix. Brand advertising still builds demand; search and social still capture it; retail media converts it at the shelf. The skill is in the allocation: understanding what each channel contributes and shifting budget toward what's measurably working. That kind of joined-up thinking is exactly what a good digital marketing strategy should deliver.
Retail media rewards brands that plan around the shopping calendar. Peak periods like Black Friday amplify everything — our Black Friday ecommerce strategy guide shows how to coordinate retail media with your wider seasonal plan.
Whether you're a brand wondering where retail media fits your budget, or a retailer considering your own network, talk to us for a free consultation. We'll help you work out where the real opportunity is — and where it isn't.
FAQs
What is a retail media network (RMN)?
An RMN is the advertising business a retailer runs on its own properties — its website, app, and stores. It sells ad space (sponsored listings, banners, in-store screens) to brands, using the retailer's first-party purchase data for targeting and measuring whether ads drove actual sales.
Why is retail media growing so quickly?
Four drivers: the decline of third-party cookies makes retailers' first-party purchase data more valuable; retailers want high-margin ad revenue; brands want advertising measurably tied to sales; and growing ecommerce means more ad inventory where shoppers are ready to buy.
How is retail media different from Google or Meta ads?
The targeting data and the measurement. Retail media targets based on actual purchase history and measures ad-to-sale in a closed loop on real transactions. Google and Meta target based on intent signals and interests, with measurement that's increasingly modelled rather than observed.
Which UK retailers have retail media networks?
Major UK operators include Tesco, Sainsbury's, Boots, and Argos, alongside Amazon's large UK business. Specialist retailers in categories like pet, baby, beauty, and DIY also run effective networks that can offer strong targeting for category brands.
How should brands measure retail media performance?
Look beyond each network's reported ROAS. Ask for incrementality (new sales versus sales that would have happened anyway), compare performance across networks on a like-for-like basis, and connect retail media results to your total sales picture — not just the retailer's dashboard.
