Kellogg’s is recalling boxes of its chocolate cornflakes following complaints of hard lumps in the cereal which could create a choking hazard.

The breakfast brand voluntarily asked consumers who had bought packs to dispose of them “as a precaution” after the issue was discovered.

Kellanova, the company which manufactures the cereal, said the hard lumps “do not break down when eaten with milk” and could also potentially damage teeth.

The Food Standards Agency said this made the product “unsafe to eat”.

Kellanova stressed that it believed only a “small proportion” of boxes could contain the lumps and that there was “minimal risk” to consumers.

It said that the affected packs had been on sale since January – when the chocolate version was first launched – in Tesco, Londis, Budgens and Booker stores.

A spokesperson for Kellanova said: “Clusters of cereal forming during production can be a normal occurrence and these usually break up when eaten or placed in milk.

“But, when we spotted that hard lumps of cereal were forming in a very small amount of our new Kellogg’s Corn Flakes Chocolate Flavour cereal, we took the decision to recall all product.

“It’s important to say that the risk of injury from these hard lumps of chocolate cereal is minimal but we’re not willing to compromise on quality or safety.”

Consumers who own have bought 450g boxes with best before dates ranging from 6 December 2024 to 28 April 2025 have been urged to throw them away and contact the brand for a full refund.

Kellanova said that other Kellogg’s Corn Flakes varieties it produces were unaffected by the issue.