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Supreme Court decision on Oatly using 'milk': Browne Jacobson comment

12 February 2026

Following a decision by the Supreme Court, the drinks manufacturer Oatly has been banned from using the word "milk" to market its plant-based products. 

Commenting on the ruling, advertising lawyer Katharine Mason said: “Although this is a trade mark case, the key points rest on the correct interpretation of food law and it’s the first time these points have been assessed in the UK courts. Specifically, the food law that defines specific “designations” which can only be used for food and drink which meets the criteria. The case is all about whether the trade mark “POST MILK GENERATION” was using “milk” as a designation for a non-milk product. 

 “In essence, milk is defined as “normal mammary secretion” which is of course not how oat-drinks are sourced. The Supreme Court rejected Oatly’s narrow interpretation of “designation” as only applying to the product name and did not consider an exemption applied.

“The ruling has confirmed that if it's not from an animal, you can't call it milk. The word 'milk' in Oatly's trademark term is a protected food term under the law and their oat drinks don't meet the legal definition. As it stands, companies launching plant-based products will need be aware of protected designations, but the future might bring a new generation of designations.”

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