In 2022, John Lewis withdrew Never Knowingly Undersold, a price promise it had made since 1925. John Lewis executive director Peter Ruis later explained that, to keep up with the promise, colleagues had checked competitors’ prices using spreadsheets and visits to other shops (Retail Gazette). Customers could compare prices online in seconds. The process behind the promise could not keep up.

When John Lewis revived the promise in September 2024, it rebuilt that process. An AI pricing system tracks 25 specific competitors, including Amazon and AO. The business made 30,000 price changes before launch, and store colleagues update price tickets every day (The Retail Bulletin).

A brand promise in retail tells customers what to expect when they shop, whether that is low prices, expert advice, or a reliable collection.

For John Lewis, bringing back the promise meant changing how the business tracked and updated prices. Other retail promises create their own operational demands. Expert advice requires trained colleagues with time to deliver it. Reliable collection needs accurate stock information and orders ready when customers arrive.

Keeping a brand promise in retail depends on how the business manages stock, staffing, systems and budgets. The teams responsible may never have helped write the promise, even though their work determines whether customers can rely on it.

How everyday changes can weaken a brand promise

Keeping the promise gets harder when teams are under pressure to cut costs or meet their own targets.

While buying reduces the range, finance may cut staffing hours, and marketing prepares the next promotion. These teams can be working separately, but their work comes together on the shop floor. A customer arrives for an advertised offer, finds their usual product has gone and struggles to find someone available to help.

Take a retailer that promises expert advice. When staffing hours are cut, experienced colleagues have less time to help new starters learn about the products. Shortening training to get people onto the shop floor sooner adds to the problem. Customers who come in expecting help may find the available person can’t answer their questions.

Colleagues will often do what they can, perhaps by ringing another branch or asking a more experienced team member who is already busy. But if they regularly have to work around staffing or training gaps, those gaps need addressing.

The same pattern applies to decisions that change what customers are expected to do, which is covered in the customer impact of retail decisions.

How to deliver a brand promise in retail: five checks

Choose one expectation customers rely on, and work it through these five checks with the people who own each part of it.

1. What do customers expect from us?

Include advertising, prices, service claims and past experience, not only the written statement. Use customers’ own words from reviews and frontline conversations, because their reading of the promise may differ from the brand book’s.

2. When do they need us to deliver on it?

Define the moment: finding a product, getting advice, collecting an order, returning something faulty. That is where customers test the promise.

3. What do our teams need to make that happen?

List the people, labour hours, product information, systems and stock the moment requires. Then specify who owns each part, such as store operations for the labour model or buying for the range, and whether they have the budget to deliver it.

4. Could anything we’re changing make it harder?

Look at what is changing across the business. If staffing hours are being reduced while we introduce a new system, will colleagues have enough time to learn it and help customers? Raise that question before the budget or project is approved, while you still have time to adjust the plan.

5. How will we know whether it’s working?

Pair an operational measure with customer feedback. For a value promise, that might be on-shelf availability alongside complaints coded to missing items. For an expertise promise, it might be mystery shop results on product knowledge alongside reviews that mention advice. Survey scores are most useful when tied to a specific change customers can feel, as discussed when we consider whether surveys still work for VoC. Agree on what needs to improve, who will take it forward and when you’ll check whether it has helped customers.

Brand promise vs brand purpose: what is the difference?

A brand purpose describes what an organisation exists to contribute. The promise gives customers a more specific expectation of the shopping experience.

The John Lewis Partnership describes its purpose as “Working in partnership for a happier world”, supported by three pillars: happier people, happier world and happier business (John Lewis). A purpose like this can guide decisions, shape culture and influence how colleagues treat people.

Never Knowingly Undersold does something more specific. A customer can check it, and a colleague knows what to do: compare the price, change the ticket, or refund the difference if the customer finds the same product cheaper within seven days.

It is easy to invest in a purpose statement and assume that is what customers hold a business to. Customers usually hold it to something narrower: its prices, delivery times, returns, and whatever it has told them they can rely on. Ask what a customer expects the statement to mean during a visit, and what colleagues need to do to deliver it. If that is difficult to explain, the business may need to be clearer about what it is promising.

Brand promise in retail: examples from Aldi, Primark and John Lewis

Aldi’s approach to its range shows how it keeps costs down to support its price promise. Primark and John Lewis show why retailers may need to change how they deliver their offer as shopping habits change.

Aldi: keeping the range manageable. Aldi tells customers they can save significantly on their grocery shop. In January 2024, chief executive Giles Hurley stated: “Our promise to customers is that they will always make significant savings on every shop with Aldi because we have the lowest grocery prices in Britain” (Aldi). Keeping its range relatively small helps Aldi control the costs behind that commitment.

In 2018, Aldi described a range of around 1,800 products, most of them own-label, with less than 10% of volume sold on promotion. Asked about expanding the range, it said this “would mean breaking the discount operation model” (CMA). A wider range would please some shoppers. It would also add the cost and complexity that low prices depend on avoiding. If customers ask for more choice, the business has to consider what a wider range would cost and whether it could still offer the same low prices. Which? found Aldi the cheapest supermarket in ten of the twelve months of 2025.

Primark: making home delivery work at affordable prices. Primark describes its offer as “affordable fashion and everyday essentials that are made to last” (Primark). For years, it resisted home delivery. In 2023, its owner, Associated British Foods, said that “anything more than click & collect would simply leave no margin”, pointing to low prices and small baskets (RetailDetail).

In September 2026, Primark announced plans to introduce home delivery in Great Britain. It said customer expectations had changed and that progress in its digital business, particularly Click & Collect, had given it confidence to proceed (Primark).

John Lewis: updating the price-checking process. The wording of Never Knowingly Undersold stayed the same for nearly a hundred years. The way customers compared prices changed completely, but the price-checking process didn’t change until 2024.

Across these examples, the promise depends on everyday decisions that make it possible to keep. As customer habits change, retailers have to adapt how they deliver the offer while protecting what customers value. Those choices shape what customers notice when they shop.

How a brand promise changes what customers notice

A promise tells customers what to check, so a failure on that point counts against the reason they chose the retailer.

A study in the Journal of Retailing examined satisfaction data from one global retailer across 400 stores in 32 countries. Customers who believed the retailer’s service promise weighted the parts of the visit that matched it more heavily. When the promise was about practical value, price and availability mattered more. For a value retailer, customers may judge the visit particularly strongly on prices and whether the products they want are available. An overall satisfaction score may not show where either has disappointed them, so you need to examine both directly. How expectations shape what customers notice is covered in more detail in enhancing perception, not experience.

A promise can also matter to customers who never use it. When Never Knowingly Undersold was withdrawn, Martin Lewis of MoneySavingExpert estimated that fewer than 1% of shoppers checked prices elsewhere after buying (TheIndustry.fashion). Yet Ruis said that once it had gone, customers wrongly assumed prices had risen. Few customers ever used the promise, but withdrawing it changed how they judged John Lewis’s prices.

Key takeaways

• Start with what customers expect and identify when they most need you to deliver.
• Check whether the responsible teams have what they need, especially when budgets, systems, or services change.
• Use customer feedback alongside operational measures to identify what needs improving, then follow through.

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