The owner of Toblerone is taking legal action against a tiny British vegan chocolate brand that it claims has been copying the Swiss chocolate bar’s famous chunky shape.

Mondelēz has filed papers at the high court in London accusing Catherine’s Originals of “passing off” and trademark infringement with its O’bar – a length of chocolate divided into segments each with a rounded semi-oval hump.

The 200g bars cost £9.20 for a milk or plain variety, and as much as £10.55 for more exotic flavours such as pumpkin spice or cinnamon swirl. A standard milk chocolate Toblerone can be bought for £2.50.

Catherine’s Originals, founded by the then teenager Catherine Dodd in 2021, makes its chocolate in Walberton in Sussex, England, and sells them via markets, online or by subscription.

Dodd said the shape of her bars reflected an O for Originals.…