Cuthbert the Caterpillar is a chocolate Swiss roll celebration cake sold exclusively by Aldi UK, famously known for being at the center of a high-profile legal battle with Marks & Spencer in 2021. The cake features a chocolate sponge filled with chocolate buttercream, encased in a hard milk chocolate shell, and decorated with multi-colored chocolate beans and a white chocolate face. Cuthbert rose to global internet stardom after M&S filed an intellectual property claim, alleging that Cuthbert was too similar to their original Colin the Caterpillar cake. As of April 2026, Cuthbert remains a permanent and best-selling fixture in Aldi stores across the United Kingdom, having successfully returned to shelves with a slightly revised design and a legacy as a viral marketing phenomenon.
The 2021 M&S Legal Battle
In April 2021, Marks & Spencer launched a legal claim against Aldi, arguing that Cuthbert infringed on their trademark for Colin the Caterpillar. M&S claimed that Aldi’s product led consumers to believe the cakes were of the same quality or originated from the same source.
Aldi responded with a viral social media campaign under the hashtag #FreeCuthbert, which garnered massive public support. The dispute was eventually settled out of court in early 2022, allowing Cuthbert to return to Aldi stores with minor cosmetic changes to his chocolate face and feet to further distinguish him from Colin.
Ingredients and Product Specifications
Cuthbert is designed as an affordable alternative to premium celebration cakes, weighing approximately 625g and serving 12 people. The cake is made with UTZ-certified cocoa, reflecting Aldi’s commitment to sustainable sourcing in its confectionery line.
The structure consists of a light chocolate sponge roll with a rich buttercream swirl. The exterior shell is tempered to provide a distinct “snap” when cut, topped with edible chocolate decorations that vary slightly during seasonal promotions, such as “Cuthbert in a Cape” or festive editions.
The #FreeCuthbert Marketing Phenomenon
The “Caterpillar Wars” are now studied in marketing textbooks as a masterclass in reactive social media management. Aldi’s Twitter (now X) account transformed a potential legal disaster into a brand-building victory by using humor and “David vs. Goliath” narratives.
During the height of the drama, Aldi even parked ad vans outside M&S stores with the slogan “Like M&S, only cheaper.” This bold approach not only increased Cuthbert’s sales but also boosted Aldi’s overall brand perception as a cheeky, consumer-focused disrupter in the UK grocery market.
Charitable Impact: Teenage Cancer Trust
Following the legal settlement, Aldi utilized Cuthbert’s fame for philanthropic purposes by launching a limited-edition version to benefit the Teenage Cancer Trust. This move further solidified public affection for the character and raised significant funds for cancer support services.
By 2026, Cuthbert has become the face of several “Cuth-fests” and fundraising events. Aldi frequently donates a percentage of sales from special Cuthbert-themed merchandise, such as plush toys and reusable bags, to their long-term charity partners, integrating the product into their corporate social responsibility strategy.
Supermarket Rivals: The Caterpillar Family
Cuthbert is part of a wider “family” of caterpillar cakes found across the UK’s major supermarkets. While Colin is the original, Cuthbert’s lower price point and viral fame have made him the primary competitor in the “budget” tier.
Cecil (Waitrose): A premium version often cited for high-quality chocolate.
Curly (Tesco): A long-standing staple in the Tesco bakery aisle.
Clyde (Asda): Known for being one of the larger cakes in the category.
Wiggles (Sainsbury’s): A popular choice for children’s parties due to its colorful decorations.
Practical Information and Planning
If you are looking to purchase a Cuthbert cake for an event in 2026, the following factual details will help you plan your shopping trip.
Where and When to Buy
Availability: Cuthbert is a core product and is available year-round in the bakery or cake aisle of Aldi stores across the UK.
Price: As of 2026, Cuthbert typically retails for £4.99 to £5.49, significantly cheaper than the premium M&S version.
Seasonal Editions: Look out for “Cuthbert the Spooky Caterpillar” in October and festive versions in December.
Tips for Serving
To get the best “snap” from the chocolate shell, it is recommended to keep Cuthbert at room temperature for about 30 minutes before serving. Use a warm knife to slice through the hard exterior to prevent the chocolate from cracking unevenly.
FAQs
Is Cuthbert the Caterpillar still sold at Aldi?
Yes, Cuthbert is a permanent product at Aldi UK and is available in stores as of April 2026.
Did M&S win the lawsuit against Aldi?
The case was settled out of court in 2022; the terms were private, but Cuthbert was allowed back on shelves with a redesigned face.
How much does a Cuthbert the Caterpillar cake cost?
In 2026, the cake usually costs between £4.99 and £5.49, depending on regional pricing and promotions.
How many people does a Cuthbert cake serve?
One standard Cuthbert cake is designed to serve 12 people, though this depends on the slice size.
What are the ingredients in Cuthbert the Caterpillar?
It is a chocolate sponge with buttercream, a milk chocolate shell, and chocolate bean decorations; it contains wheat, eggs, milk, and soy.
Is Cuthbert the Caterpillar vegetarian?
Yes, Cuthbert is suitable for vegetarians, but you should always check the packaging for the most up-to-date allergen and dietary information.
Does Cuthbert the Caterpillar contain nuts?
While nuts are not a primary ingredient, the cake is produced in facilities that handle nuts, so there is a risk of cross-contamination.
Who is the original caterpillar cake?
Colin the Caterpillar, launched by Marks & Spencer in 1990, is the original creator of the supermarket caterpillar cake trend.
Why was Cuthbert the Caterpillar “freed”?
#FreeCuthbert was a social media campaign by Aldi to gain public support during their legal battle with M&S.
Can you buy Cuthbert the Caterpillar online?
Cuthbert can be purchased via Aldi’s grocery delivery partners (like Deliveroo) or through Aldi’s “Click and Collect” service where available.
What is the difference between Cuthbert and Colin?
The primary differences are the price, the shape of the chocolate face, and the specific blend of chocolate used in the outer shell.
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