Digital shelf labels are spreading. Can supermarket prices change while you shop?

An electronic shelf label is a display technology. Dynamic pricing is a pricing strategy. The presence of a digital label does not prove that a supermarket is increasing prices when demand rises, and ConsumerWise has not found evidence that the UK rollouts described in this article are presently being used for in-aisle surge pricing.

Small electronic screens are replacing paper price tickets in a growing number of UK supermarkets. They can be updated centrally in seconds, display loyalty offers and unit prices, help staff find products and remove the need to replace thousands of paper labels by hand.

That same speed creates a reasonable consumer question. If the price can change instantly, what happens when a shopper picks up an item at one price and the system changes it before the shopper reaches the checkout?

Morrisons announced in October 2025 that it would install 10.8 million electronic shelf labels across all 497 of its supermarkets, with the rollout beginning in 2026. The retailer said the system would improve the accuracy of price and product information, communicate More Card offers instantly and release staff from a repetitive manual task.

Industry reports in June 2026 said Tesco had agreed a multi-year rollout covering approximately 3,000 stores after earlier trials. Other UK grocers have also used or trialled electronic shelf-label technology.

The Bank of England added a wider economic dimension in April 2026. It said some sectors were experimenting with technology that could enable dynamic pricing in future and gave electronic shelf labels in supermarkets as an example. It did not say that the labels themselves were evidence of unlawful conduct or that UK supermarkets were already imposing surge prices on groceries.

Prices can be changed more frequently, across many products and stores, with less human intervention. Without clear controls, that creates risks around timing, proof, accessibility, loyalty conditions and the price a shopper reasonably understood when deciding to buy.

A retailer could use electronic labels while changing prices no more frequently than it did with paper. It could also use them only for reductions during opening hours. Conversely, a dynamic price can be used online without any shelf label at all. The consumer issue is therefore the pricing practice and the information supplied, not the screen technology by itself.

A retailer could use electronic labels while changing prices no more frequently than it did with paper. It could also use them only for reductions during opening hours. Conversely, a dynamic price can be used online without any shelf label at all. The consumer issue is therefore the pricing practice and the information supplied, not the screen technology by itself.

Dynamic pricing is not automatically unlawful in the UK. The legal risk arises where consumers are given false, unclear or incomplete price information, cannot understand material features of the pricing model or are charged a price that does not match the invitation to purchase on which they acted.

The Consumer Protection from Unfair Trading Regulations 2008 are no longer the main current framework for new conduct. From 6 April 2025, their core protections were replaced and updated by the unfair commercial practices provisions in Chapter 1 of Part 4 of the Digital Markets, Competition and Consumers Act 2024.

The CMA's current guidance says that information about how a dynamic pricing model works may be material where the average consumer needs it to make an informed decision. Depending on the circumstances, this could include saying that prices are not static, explaining what makes them change and identifying a relevant price range.

The CMA has also said that an invitation to purchase must contain the total price the consumer will pay. If the indicated price differs from the price the consumer actually has to pay, that may infringe the law and may also amount to a misleading action.

The Price Marking Order 2004, as amended, applies regardless of whether a shelf label is paper or electronic. The selling price must be unambiguous, easily identifiable, clearly legible and displayed close to the product. Where unit pricing is required, that information must also be displayed correctly.

Government guidance published with the CMA and Trading Standards tells retailers that the displayed price should match what the customer is charged at the till. It also says that, when increasing a price, the shelf-edge label should be changed before the higher price is charged.

The first point is often misunderstood. A shelf display is normally an invitation for the customer to make an offer to buy. If the higher price is identified before payment, the customer does not usually have a legal right to force the retailer to sell at the lower shelf price. The customer can ask the store to honour it, but can also refuse the transaction.

That contract-law position does not give retailers permission to display misleading prices. A genuine isolated mistake and a system that repeatedly shows consumers one price before charging another are not the same thing. The latter can raise regulatory and enforcement issues even where an individual shopper cannot compel a sale at the lower price.

A paper ticket may remain in place after a purchase. A digital display can change before the shopper returns to photograph it. A receipt, a contemporaneous photograph, a witness and the retailer's own price-change audit log may therefore become important in resolving what was displayed at the relevant time.

Suppose a shopper sees £2, puts the product in a trolley and continues shopping. The central system changes the electronic label and checkout price to £2.50 before payment. By the time the mismatch is challenged, the shelf also shows £2.50. There may be no visible discrepancy even though the shopper says the earlier display influenced the decision to buy.

Current law does not create a simple rule that physically picking up an item permanently locks its displayed price. The analysis may depend on the exact facts, the information presented, when the contractual offer and acceptance occurred and whether the commercial practice was misleading. It would be unsafe to tell consumers that every item is legally frozen at the price first seen.

This is where retailer policy and system design should go further than the legal minimum. A supermarket controls the price-change records and knows exactly when each label and checkout price was updated. The shopper normally does not.

Retailers could also publish a plain-language electronic pricing policy stating whether prices may rise during trading hours, whether only reductions occur in real time, what evidence is retained and how long a shopper has to claim the lower recently displayed price.

Yes. Paper labels and checkout databases can fall out of step because staff must physically replace tickets. Linking the display and till to the same central record could remove many ordinary mismatches. That is one of the strongest consumer arguments in favour of electronic labels.

The CMA's 2024 grocery pricing review found pricing errors across the stores it inspected. Supermarkets had the lowest reported error rate of the store types examined at 4.2%, but 60% of all errors identified across the review resulted in a higher price at the till. Better synchronisation could reduce that problem if the system is designed and governed properly.

The concern is therefore not that digital labels are inherently anti-consumer. It is that a system capable of improving accuracy is also capable of changing prices at a speed that makes scrutiny and evidence harder. Both propositions can be true.

Trading Standards can investigate retail pricing practices, while the CMA now has direct consumer enforcement powers under the Digital Markets, Competition and Consumers Act. The CMA can determine infringements and impose penalties of up to the higher statutory limits, including up to 10% of worldwide turnover for relevant breaches.

That does not mean every incorrect label will lead to a major investigation. Enforcement bodies consider matters such as seriousness, scale, evidence, consumer harm and whether conduct is repeated. A pattern across products or stores is more significant than a single corrected mistake.

The real test will not be whether supermarkets replace paper with screens. It will be whether they publish fair rules for when prices can change, preserve an auditable history and ensure that the price seen by the shopper remains the price presented at checkout. Technology can make pricing more accurate. It should not make the truth harder to prove.