When shoppers pick up everyday items like cereal or cleaning products, they generally trust that the price displayed on the shelf tells the full story. Yet a recent investigation revealed that several Asda stores were missing key information the law requires: unit prices. These labels, which show the cost per kilogram or per litre, are essential for comparing value especially at a time when product sizes often shrink while prices remain unchanged.
The discovery has pushed the issue of pricing transparency back into the spotlight, raising questions about how UK law works, what went wrong inside Asda stores, and what shoppers can do when faced with incomplete information.
What Does UK Law Require?
Under the Price Marking Order 2004, supermarkets larger than 280 m² must display both the selling price and the unit price for products sold by weight, volume or standard measure. The rule applies to a wide range of goods, from cereal boxes to toiletries. Its objective is simple: make it possible for consumers to compare prices on an equal footing, regardless of package size or branding.
Recent updates introduced in the Price Marking Amendment Order 2024 and phased in from October 2025 reinforce these obligations. The revised framework aims to close gaps identified by consumer groups who noted inconsistencies across major retailers.
Enforcement is handled by Trading Standards and the Competition and Markets Authority (CMA). When breaches occur, penalties can reach £5,000 per offence, reflecting the importance placed on clear, reliable price displays. Without this information, comparisons between brands or pack sizes become significantly harder.
What the Investigation Found in Asda Stores
According to reporting from the Express, several Asda stores displayed items without the legally required unit price. Products included familiar staples such as Weetabix, dishwasher tablets, cotton buds, and tumble-dryer sheets. The omissions were found across multiple categories rather than confined to a single aisle or product type.
Asda acknowledged the issue and issued a public apology. The supermarket attributed the problem to a major internal update to its pricing systems, explaining that some labels lost unit price information during the transition. The company said corrective measures were already underway to restore full compliance.
This is not the first time Asda has faced scrutiny over pricing clarity. In recent years, the CMA has examined how supermarkets present promotional prices and loyalty-related discounts, signalling increased regulatory attention across the sector. System changes, rapid updates and complex promotions can all increase the risk of errors slipping through.
Why Unit Pricing Matters More Than Ever
The importance of unit pricing has grown alongside a persistent trend in the retail sector: shrinkflation. This practice involves reducing the size or weight of a product while maintaining the previous price. The Office for National Statistics has documented hundreds of such changes over the past decade, and consumer groups suggest the trend has accelerated during periods of inflation.
Without clear unit pricing, these changes are difficult to spot. A box of biscuits may look the same but contain fewer grams than before, creating a higher cost per 100g. In some cases, analyses have shown double-digit increases in the unit price over time despite minimal changes to the total price displayed on the shelf.
In practice, unit pricing helps illuminate these differences. It allows shoppers to see, at a glance, whether the “cheaper” option actually costs more per portion or if a larger package represents better value. During a period when household budgets remain under pressure, this information becomes essential to avoid paying more than expected.
What Shoppers Can Do in Stores
Checking the unit price is one of the simplest ways to understand real value. Most labels show it as the cost per 100g, per kilogram, per litre or another standard measure. When labels are missing or appear incomplete, shoppers can report the issue to staff; retailers are legally required to correct the information.
A few practical habits can help:
- Compare unit prices across sizes: the biggest pack is not always the cheapest per unit.
- Check promotional labels carefully: multi-buy deals can sometimes offer poorer value than standard pricing.
- Watch for “new” or “improved” labels: these often coincide with packaging or size changes.
- Query discrepancies: if the checkout price doesn’t match the shelf price, staff must investigate.
If a store fails to correct persistent issues, concerns can be raised with local Trading Standards offices.
A Wider Shift in Consumer Protection
The Asda case arrives at a moment of broader change in UK consumer regulation. The Digital Markets, Competition and Consumers Act 2024 has expanded enforcement powers, giving regulators more scope to investigate pricing practices and intervene when necessary. At the same time, scrutiny around supermarket promotions, loyalty pricing and digital receipts continues to increase.
Retailers must navigate several overlapping regulations, including the Consumer Protection from Unfair Trading Regulations 2008, which prohibit misleading omissions. The combined framework is intended to ensure that shoppers receive accurate and consistent information throughout their buying decisions.
For consumers, understanding these rules provides a useful advantage. Recognising when information is missing and knowing that retailers are obliged to display it helps ensure fair treatment. It also reinforces the importance of unit pricing as a practical tool at a time when price changes and product resizing remain common across the grocery sector.
