Dairy UK Ltd v Oatly AB: Supreme Court strikes down POST MILK GENERATION trademark

What happened

Oatly, the maker of oat-based drinks, registered POST MILK GENERATION as a trademark covering oat-based food, drink and T-shirts. Dairy UK, the trade association for the UK dairy industry, applied to invalidate the registration for the food and drink classes. It argued the mark breached rules that reserve terms like 'milk' for genuine dairy products. The dispute moved through the Intellectual Property Office, the High Court and the Court of Appeal before reaching the Supreme Court, with Oatly appealing each adverse decision along the way.

What did the court decide in Dairy UK v Oatly AB?

The Supreme Court dismissed Oatly's appeal. It held that 'designation' in the relevant rules covers any use of the word 'milk' in connection with a product, not just use of 'milk' as the product's actual name. That meant POST MILK GENERATION was a prohibited designation when used for oat-based food and drink, even though it didn't call the product milk outright. The court also rejected Oatly's argument that the mark fell within an exception for marks that clearly describe a characteristic of the goods, such as being milk-free. It found the phrase was more naturally read as referring to a generation of consumers, not to a quality of the product, so the exception didn't apply and the registration stayed invalid for those goods.

What we learned from this

• What I'd take from this is that courts will look at how a word like 'milk' functions within a trademark, not just whether it's used as a straightforward product name. Oatly's play on words wasn't enough to escape that.
• If you're branding a plant-based alternative, think carefully before building a protected dairy term into your name, logo or tagline, even as wordplay.
• Don't assume a descriptive exception will rescue a mark just because it has a double meaning. The court will ask what the phrase most naturally conveys to consumers.
• This ran from the IPO through three further courts. Invalidation disputes over borderline wording can be a long and costly road.

Things to be aware of

The businesses involved

What happened next

• The BBC reported that following the ruling, Dairy UK's chief executive welcomed the decision on behalf of the trade body.Source: Bbc, February 2026
• The Guardian reported that Oatly was banned from using the word 'milk' to market its plant-based products in the UK as a result of the ruling.Source: The Guardian, February 2026
• FoodNavigator described the outcome as a significant win for the dairy industry over Oatly's marketing of oat-based products.Source: Foodnavigator, February 2026
• Food Ingredients First reported that the Supreme Court's ruling was unanimous in barring Oatly from using the POST MILK GENERATION trademark.Source: Food Ingredients First, February 2026

What others said about it

• Morgan Lewis says the ruling affirms that dairy-related terms are reserved exclusively for milk-based products, a point plant-based brands need to factor into naming decisions.Source: Morgan Lewis, February 2026
• Wolters Kluwer's Trademark Blog calls this the final decision in a four-year dispute, with Oatly having appealed the Court of Appeal's decision all the way up.Source: Legalblogs, March 2026
• IPKat notes section 3(4) of the Trade Marks Act 1994 is the legal basis precluding registration of marks like this, framing it as part of a wider pattern of 'milk' word bans.Source: IPKat, February 2026
• Clarion Solicitors warns the case is an important lesson for anyone looking to protect brands that play with terms borrowed from another protected category.Source: Clarionsolicitors, February 2026
• AGDAILY frames the decision simply: Oatly cannot use the word 'milk' in its trademark for oat-based foods and drinks.Source: AGDAILY, February 2026