Shelf price different from the till price: what the rules say in the UK

If the shelf label shows one price and the till charges more, it is the shop that is exposed under UK rules: charging more than the displayed price can be a misleading action, and trader guidance lists a discount not applied at the till as a false claim.

Ask for the shelf price, photograph the label, keep the receipt and complain if needed.

This page answers the shopper first and the retailer second: why it happens and how far an electronic shelf label goes towards preventing it. It is not legal advice. The legislation was read on 9 November 2026 and a solicitor’s review is pending. The other shelf-price rules (unit pricing, was-prices, batteries) are summarised in the guide to shelf price rules, and pharmacy, which has its own regime, is covered in a separate article on price errors at the pharmacy till. A note on scope: this is Great Britain; Northern Ireland follows partly different rules that we have not reviewed.

What the rules actually say

There is no section that says, in so many words, “the shelf price wins”. Anyone who tells you so is summarising rather than quoting. What exists is a set of provisions that point the same way, and a gap that the sources we read do not fill.

Misleading actions

Section 226 of the Digital Markets, Competition and Consumers Act 2024 describes a misleading action as a commercial practice that involves false or misleading information, or an overall presentation likely to deceive the average consumer, about something relevant to a purchasing decision. True information can still count if it is presented in a way that misleads. The section does not use the word “price”, but price is plainly information a shopper relies on; that is our reading, not a quotation, and it is one of the points for the solicitor’s review.

What the official guidance says

The Chartered Trading Standards Institute’s guidance for traders, published on Business Companion, does not discuss shelf versus till by name. The closest it comes is an example of a claim that is not honoured: “10% off all main courses” where the price is not adjusted at the till. It also tells traders not to advertise a price promotion for a product that is not available at that price. Those are the nearest official statements we found, and they point at the same risk.

What the Price Marking Order does and does not do

The Price Marking Order 2004 is about the unit price (price per kilo or litre). Article 5 requires a trader who indicates that a product is for sale to show its unit price. It does not, as far as the article we read goes, require a selling price to be stated in the first place, so it is not the source of a “shelf price must equal till price” rule. Its relevance here is limited to unit prices, which can themselves be wrong on a label.

The gap

What we did not find: a rule that the customer may insist on the lower price, and a source on how a plain error is treated. Under general contract law the shelf price is commonly treated as an invitation rather than a binding offer. We did not read a source for that and have not tested it; it is listed for legal review and this page does not rely on it.

What to do if it happens to you

This is common sense drawn from the above, not an official procedure.

1. Before you pay, tell the cashier and ask to be charged the shelf price. This is when it costs a minute rather than a dispute.
2. Photograph the label, with the product and the price visible. A screen label can change within minutes, so the photo is your evidence.
3. Keep the receipt. After payment, the receipt and the photo together document the difference.
4. Complain to the shop in writing, by customer service or email, quoting the date, store and product.
5. If that fails, contact your local authority’s Trading Standards service, which enforces the Price Marking Order, or a consumer advice service that can point you there.

For a difference of 40p few people get beyond step 3. That does not make the discrepancy less real, but it explains how a shop can accumulate errors without paying for them quickly.

Why it happens

There is rarely one cause. In shops using paper shelf-edge labels these recur.

The price reaches the till before the shelf. The pricing system or ERP applies a new price list and the till updates at once, while the labels wait for someone to print, carry and fit them. With paper, every bulk change costs a weekend of work, and some labels are always left behind.

The promotion is not in both places. The offer ticket goes up but the discount rule is not loaded at the till, or the two end on different dates. It also happens in reverse, with the till applying an offer whose ticket has come down, and then the error favours the customer.

A misplaced label. The price is right but sits under the neighbouring product, so the shopper reads one item and scans another.

Bad master data. A wrong decimal or pack size is copied faithfully to the till and the label, and no label technology will detect it.

For an order of magnitude there is a 1998 study by the US Federal Trade Commission, Price Check II. It inspected 107,096 items in 1,033 stores in 36 states and found a price error on 3.35 % of items (about one in 30), split roughly evenly between undercharges and overcharges. Among sale items, the failures it identified were incorrect shelf prices, outdated signs and wrong prices in the computer. It is American, nearly thirty years old and covers different kinds of shops, so do not read it as a UK figure; its value is the pattern of causes, which will look familiar to any retailer with paper prices.

What an electronic shelf label adds, and what it does not

An electronic shelf label receives its price from the same system that feeds the till. What changes is the route.

Cause of the mismatch	Does an ESL help?	Why
Paper label not changed in time	Yes	The change goes out by radio and does not depend on someone walking the aisle
Offer ticket removed late	Yes, if the end date is scheduled	The label reverts to the normal price on the planned date
Promotion loaded at the till but not on the label (or vice versa)	Partly	If both read the same rule at source they agree; if configured separately they do not
Wrong price in the ERP or item master	No	Label and till repeat the same data
Label fitted in the wrong slot	Not by itself	Each label must be linked to the right item, and that must be checked
Label that misses the update (battery, coverage, gateway fault)	No	It keeps showing the old price, and the shopper cannot tell

The last row deserves attention because it gives false reassurance. A label that has not received a change keeps showing the old price perfectly normally; there is no visible error. Depending on the system, a missing acknowledgement can be reported to the store team, and that is a question to put to any supplier before buying: what does the manager see when a label does not confirm, and how quickly. How the price travels from ERP to screen is explained in the technical guide.

There is a less technical limit too. Synchronising label and till does not create a right or remove one: the issue is whether the price shown is the price charged, on paper or on a screen. Nothing we read prevents changing prices often; what matters is that the price a shopper sees is the one charged and that, on reductions, the reference price is handled properly (the UK approach differs from the EU’s 30-day rule, as that page explains). Changing prices several times a day is covered under dynamic pricing.

If you are the retailer: three useful checks

None of these is a legal requirement. They follow from the above and from the fact that, in a dispute, the burden of showing what happened falls practically on the trader.

1. One source of price. Label, till and web should read from the same origin; if two systems each store the price, they will diverge sooner or later.
2. Keep a change log with date and time, and with the time each label confirmed it had received the price. In a complaint, that record is your evidence.
3. Audit a sample every week: pick twenty items at random, compare label and till, and write down the result. It is what an officer would do, and it costs less than an enforcement visit. If you are working out how much manual relabelling a rollout would save, the total cost calculator puts numbers on it.