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The UK Supreme Court has delivered a decisive blow to Oatly’s branding strategy in the UK, dismissing the company's appeal and ruling that the trademark “Post Milk Generation” is invalid for use on oat-based food and drink products.

The unanimous judgment in the case of Dairy UK Ltd v Oatly AB sets a significant legal precedent for the food and beverage industry. It establishes that the prohibition on using protected dairy terms (such as "milk," "cheese," and "yoghurt") for plant-based products extends beyond product descriptors to include marketing slogans and broader brand trademarks.

The Legal Reasoning: Slogans as 'Designations'

At the heart of the dispute was the interpretation of Regulation (EU) No 1308/2013 (retained in UK law post-Brexit), which reserves specific dairy terms exclusively for products derived from mammary secretions.

Oatly argued that "Post Milk Generation" was a strapline denoting a consumer demographic or cultural shift, rather than a description of the product itself. However, the Supreme Court rejected this distinction.

Key Findings from the Judgment:

• Designation vs. Description: The Court found that the word "milk" within the slogan functioned as a "designation" of the product likely to confuse consumers, rather than purely a cultural reference.

• No Exception for Slogans: The ruling clarifies that trademarks and marketing lines are not exempt from the regulation. If a slogan uses a protected term in relation to a competing plant-based product, it risks infringing on the protection afforded to dairy.

• Consumer Perception: The phrase was deemed not to clearly describe a characteristic quality (such as being "milk-free") in a sufficiently direct way to fall within the regulation's exceptions.

Implications for the Plant-Based Sector

For marketing directors and brand strategists in the plant-based category, this ruling significantly tightens the regulatory guardrails.

Richard May, partner at law firm Osborne Clarke, noted the immediate commercial impact:

The judgment suggests that playful misspellings (e.g., "mylk," "sheese") or slogans that juxtaposition plant-based products against dairy incumbents will now face stricter judicial scrutiny if challenged.

Oatly's Response: "Stifling Competition"

Oatly, known for its provocative and activist marketing style, reacted strongly to the decision.

Bryan Carroll, General Manager for Oatly UK & Ireland, stated: “We are deeply disappointed by today's UK Supreme Court ruling. In our view, prohibiting the trademarking of the slogan 'Post Milk Generation' for use on our products in the UK is a way to stifle competition and is not in the interests of the British public. This decision creates unnecessary confusion and an uneven playing field for plant-based products that solely benefits Big Dairy.”

Despite the ruling affecting food and drink classes (Classes 29, 30, and 32), Oatly confirmed it retains the trademark for Class 25, allowing the slogan to remain on merchandise such as t-shirts and apparel.

Industry Context

This ruling is a major victory for Dairy UK, the trade association representing the dairy supply chain, which brought the challenge. It reinforces the protective "moat" around dairy terminology at a time when plant-based alternatives are aggressively seeking to commoditise and replace traditional dairy staples.

For the wider industry, the message is clear: the courts are taking a literal and restrictive interpretation of retained EU agricultural law. Brands must now rigorously audit their intellectual property portfolios to ensure slogans do not inadvertently trigger "designation" breaches.