There are not many supermarket products that make it to the High Court, trend on social media, inspire charity campaigns and still end up back on the shelf more popular than before. Cuthbert the Caterpillar managed all of that. What started as a budget-friendly birthday cake sitting quietly in Aldi’s bakery aisle became one of the most talked-about food stories in British retail history, and five years on from the legal drama that gripped the nation, Cuthbert remains a genuine fixture of British celebration culture.
For shoppers in Sheffield and across South Yorkshire, Cuthbert is not just a cake. He represents something broader: the idea that you should not have to spend a fortune to feed a room full of children at a birthday party, and that a supermarket’s own-brand offering can hold its own against the premium alternative. This is the full story of Cuthbert the Caterpillar, from Aldi’s shelves to the English High Court and back again.
What Is Cuthbert the Caterpillar?
Cuthbert the Caterpillar is Aldi’s caterpillar-shaped celebration cake, sold in the supermarket’s bakery section at a price that consistently undercuts its rivals. The cake itself is a chocolate sponge roll decorated to resemble a caterpillar, complete with a characterful face, and it comes ready to serve for birthdays, children’s parties and family gatherings. It weighs 625g and at the time of writing retails at £6.99, working out at roughly £11.18 per kilogram.
The product sits firmly within Aldi’s broader Specialbuys and everyday range philosophy: deliver something that looks and tastes comparable to branded alternatives at a meaningfully lower price. That formula has served the German discounter well across almost every category it operates in, and Cuthbert proved to be one of its most resonant examples. The cake is not a complex artisan creation, nor does it try to be. What it offers is decent chocolate sponge, a crowd-pleasing design and a price tag that parents across the country genuinely appreciate.
Beyond its function as a birthday cake, Cuthbert became a cultural touchstone. Its resemblance to a certain M&S rival, its cheeky social media persona during the legal dispute, and its charitable cameo during a national health crisis all contributed to a public profile far larger than most supermarket cakes ever achieve. At a time when people were looking for reasons to smile, a caterpillar cake became oddly important.
The Story Behind Cuthbert the Caterpillar
To understand Cuthbert, you need to understand Colin. Marks and Spencer launched Colin the Caterpillar in 1990, making it the first commercially produced caterpillar cake of its kind in the UK. Colin was an immediate success, tapping into a demand for novelty celebration cakes that looked fun and tasted reliably good. Over the following three decades, M&S would sell more than 15 million Colin cakes, building genuine brand equity around a product that had become synonymous with British birthday parties.
Aldi entered the caterpillar cake market significantly later with Cuthbert, positioning him as the discounter’s equivalent. The timing made commercial sense. By the time Cuthbert arrived, caterpillar cakes had become a recognisable format in British supermarket culture, and budget-conscious shoppers were receptive to an affordable version of a familiar favourite. Cuthbert’s design closely echoed the established template: a rolled chocolate sponge, a smiling face and a price that gave M&S’s premium positioning something to think about.
For many years, Cuthbert coexisted with Colin on something close to peaceful terms. Other supermarkets had launched their own versions too, including Asda’s Charlotte, Tesco’s Curly the Caterpillar and Sainsbury’s Wiggles. The market had, in effect, accepted the caterpillar cake as a shared genre rather than a proprietary concept. That would change in spring 2021.
Cuthbert the Caterpillar vs Colin the Caterpillar
The comparison between Cuthbert and Colin is natural, unavoidable and, for millions of British shoppers, entirely intentional. Both are chocolate sponge roll cakes designed to look like caterpillars. Both feature decorated faces, chocolate coatings and festive packaging aimed squarely at the birthday party market. For consumers, the question has never really been which one is better in any absolute sense. The question has always been: how much does it matter to you?
Colin retails at £9.50 and carries the weight of the M&S name behind it. For shoppers who value M&S quality assurance, the brand reputation of a retailer that has built decades of trust in food, or simply the prestige that comes with presenting a recognisable premium product at a party, that premium is worth paying. Cuthbert costs £6.99 and carries the Aldi name, which in 2026 is a considerably more respected proposition than it would have been even ten years ago.
Taste comparisons in consumer reviews and food media have tended to produce results that are closer than the £2.51 price gap might suggest. The chocolate sponge in both products is well-regarded. Neither cake attempts gourmet complexity, and neither needs to. Where Colin may edge ahead in packaging finish and the overall presentation experience, Cuthbert competes effectively on flavour and serves its purpose without compromise. For a household feeding twelve children at a Saturday afternoon birthday party, saving two-and-a-half pounds is not nothing.
The M&S and Aldi Legal Battle Explained
In April 2021, M&S filed an intellectual property claim against Aldi at the English High Court. The retailer alleged that Cuthbert the Caterpillar rode on the coat-tails of Colin’s established reputation, and that the similarities between the two products in appearance and packaging were sufficient to mislead consumers about their origin or quality. It was an unusual legal action, and it attracted attention far beyond the confines of a routine intellectual property dispute.
Aldi’s response was characteristic of the brand’s marketing instincts. Rather than adopting a defensive or low-profile posture, the discounter leaned into the public interest surrounding the case. When Aldi announced it was bringing back a limited edition Cuthbert to raise money for Teenage Cancer Trust and Macmillan Cancer Support, using the hashtag #CaterpillarsForCancer, the story shifted from a legal dispute to a social media phenomenon. M&S pushed back, but public sympathy had already started to form in complex ways: support for M&S’s right to protect a genuinely iconic product sitting alongside admiration for Aldi’s nerve in turning a lawsuit into a charity campaign.
The case never reached trial. By November 2021, the two retailers had reached a confidential settlement, and the High Court formally recorded the withdrawal of the claim in February 2022. Neither party disclosed the terms. M&S said it was “pleased” with the outcome. Aldi declared that Cuthbert was “free” and would be returning to shelves. The redesigned Cuthbert, relabelled simply as “Cuthbert” rather than “Cuthbert the Caterpillar” on its packaging, returned to Aldi stores in June 2022 at a price of £4.99.
What the case actually established in legal terms is limited, given that no judgement was issued. What it established in cultural terms is far more durable. The story became a referendum on supermarket values, consumer loyalty and the question of whether a beloved product shape can truly belong to anyone. Legal scholars wrote about it. Food journalists filed reams of copy. Sheffield shoppers discussed it in Aldi aisles and M&S food halls alike. In the end, it made both cakes more famous.
Why British Shoppers Love Caterpillar Cakes
Nostalgia is a powerful purchasing driver, and caterpillar cakes occupy a particular corner of British food memory. For anyone who grew up in the 1990s or 2000s, a caterpillar cake at a birthday party was not just a cake. It was a marker of celebration, a signal that an occasion mattered, and a reliable source of sugar-fuelled joy for every child in the room. That emotional association does not fade easily.
M&S sold more than 15 million Colin cakes between 1990 and the early 2020s, and that figure is a measure of a product that entered British domestic ritual. When Aldi made the same format accessible at a lower price, it extended that ritual to households for whom the M&S price point had been a barrier. The caterpillar cake, as a category, became genuinely democratic. You could have one regardless of budget, and the children at the party rarely cared which supermarket’s name was on the box.
Social media amplified the affection. The 2021 legal battle generated enormous organic engagement across Twitter, Instagram and TikTok, but even before that, caterpillar cakes were a reliable presence in birthday party content. The cheerful face, the bright colours and the immediately recognisable format photograph well, and food content that photographs well tends to travel. Cuthbert’s own social media presence during the legal saga, playing up his imprisonment narrative with a wit that felt genuinely human, only deepened the connection people felt with a cake that was, at its core, a rolled chocolate sponge.
What Sheffield Shoppers Think About Cuthbert the Caterpillar
Sheffield is a city that has always understood the value of a pound. Its retail culture reflects a working-class pragmatism that has survived post-industrial change, and its shoppers are not easily seduced by premium branding when a comparable product is available at a lower price nearby. Aldi’s presence across Sheffield and South Yorkshire is substantial, and the chain performs strongly in an area where value-consciousness is not just a trend but a long-established habit.
For Sheffield families planning a birthday party, Cuthbert the Caterpillar represents exactly the kind of sensible purchase that the city’s shoppers appreciate. Feeding fifteen to twenty people at a party from a single cake that costs under seven pounds is a genuinely appealing proposition, and the quality on offer is sufficient to carry the occasion. Sheffield parents who might occasionally treat themselves to M&S food for a special meal are perfectly comfortable picking Cuthbert for a children’s party rather than spending significantly more on Colin.
The broader supermarket landscape in Sheffield reflects national trends. Aldi’s market presence in the UK has grown considerably over the past decade, and the chain’s reputation has moved from “cheap and cheerful” to something closer to “smart and reliable.” That shift matters for products like Cuthbert. When Aldi’s brand credibility improves, the products it sells benefit from the halo effect. Cuthbert is no longer simply the cheap caterpillar cake. He is the Aldi caterpillar cake, and in 2026, those are not the same thing.
How Much Does Cuthbert the Caterpillar Cost?
Cuthbert the Caterpillar currently retails at £6.99 for a 625g cake, which works out at £11.18 per kilogram. By comparison, M&S’s Colin the Caterpillar is priced at £9.50, and Lidl’s newly launched Cooper the Caterpillar, which entered the market in June 2026, is also priced at £6.99. On the metric of price per kilogram, Cuthbert sits at the affordable end of the caterpillar cake market, and for a product that serves approximately eight people, the per-head cost is less than ninety pence.
That pricing reflects Aldi’s core market positioning. The discounter operates on tight margins with a streamlined product range, a model that allows it to undercut conventional supermarkets consistently across categories. In the celebration cake market, where M&S commands a premium through brand recognition and quality assurance, Aldi’s ability to offer a credible alternative for roughly two-and-a-half pounds less is a meaningful competitive advantage.
The price has changed since Cuthbert’s post-settlement relaunch. When the redesigned cake returned to shelves in June 2022, it was priced at £4.99. The increase to £6.99 reflects the inflationary pressures that have affected the entire UK grocery sector, but Cuthbert’s price remains lower than Colin’s. For budget-conscious shoppers, that gap continues to matter.
Is Cuthbert the Caterpillar Still Available in 2026?
Yes. Cuthbert the Caterpillar remains on sale through Aldi’s UK stores and is listed on the Aldi UK website as an active product. The current price is £6.99, and the cake is available in the bakery section. As with many Aldi products, availability can vary between individual stores and may be subject to seasonal fluctuations or limited runs. Shoppers in Sheffield and elsewhere are advised to check the Aldi website or use the store’s product locator tool before making a specific trip.
The caterpillar cake market in 2026 is more competitive than it has ever been. Lidl entered the space with Cooper the Caterpillar in June 2026, priced at £6.99 and supported by a promotional campaign including a giveaway and a dedicated website. M&S, meanwhile, has continued to develop the Colin franchise, launching an Arctic Colin ice cream cake variant in 2025, priced at £16 for a 765g serving. The market has diversified significantly from the relatively simple supermarket landscape of a decade ago.
Within this increasingly busy competitive environment, Cuthbert’s longevity is itself an achievement. Many supermarket own-label products are quietly discontinued when a legal dispute or brand review creates uncertainty. Cuthbert survived a High Court claim, underwent a redesign and returned to shelves with renewed public recognition. In 2026, that resilience appears to have paid off.
Why Supermarket Nostalgia Is Driving Consumer Trends
The appeal of Cuthbert the Caterpillar cannot be fully understood without considering the broader emotional landscape of British retail. Since the cost-of-living pressures of the early 2020s sharpened household spending habits, British consumers have increasingly turned to familiar, comforting purchases as a form of affordable pleasure. A caterpillar cake at a birthday party is not extravagant, but it feels festive. It signals that the occasion has been taken seriously, without the financial anxiety that a more expensive purchase might create.
NielsenIQ research published in 2025 found that 50 per cent of global consumers reported purchasing more private-label products than ever before, driven by value-focused shopping behaviours. In the UK context, that trend has played out visibly in the supermarket cake and confectionery aisle. Products that deliver emotional satisfaction at a low price — caterpillar cakes, Swiss rolls, supermarket brownies — have maintained strong sales through a period when discretionary spending elsewhere contracted sharply.
The nostalgia factor compounds this. Shoppers who grew up with Colin the Caterpillar in the 1990s are now parents themselves, and many of them are buying caterpillar cakes for their own children’s birthday parties. The product carries an intergenerational familiarity that most marketing budgets cannot replicate. Cuthbert benefits from that familiarity without needing to have earned it independently. He arrives in a category already laden with positive associations and offers the same experience at a lower price. In a cost-conscious retail environment, that is a structurally powerful position to occupy.
Is Cuthbert the Caterpillar Still Worth Buying?
In a word: yes. Cuthbert the Caterpillar is a well-priced, widely available celebration cake that delivers what it promises. At £6.99 for a 625g cake, it offers genuine value in a market where comparable products cost meaningfully more. The post-settlement redesign updated the product without stripping it of the characteristics that made it recognisable in the first place, and the brand’s survival through a High Court dispute has, if anything, increased its public profile.
For shoppers in Sheffield and South Yorkshire, Cuthbert represents exactly the kind of sensible, satisfying purchase that Aldi has built its reputation on. He is not trying to be Colin. He never was, despite what M&S argued in their legal filing. What he is trying to be is a decent birthday cake at a price that does not require a second thought, and on that measure, he succeeds consistently.
The broader caterpillar cake market will continue to evolve. Lidl’s entry with Cooper the Caterpillar in June 2026 suggests the format still has commercial momentum, and M&S’s decision to extend Colin into ice cream territory indicates that premium caterpillar products have growth potential in their own right. Where Cuthbert sits in that landscape is clear: he is the accessible choice, the value-conscious choice, and in the current economic climate, the choice that a significant proportion of British households will continue to make. That is not a consolation prize. In 2026, it is simply good business.
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