"Colin the Caterpillar" is a chocolate roll cake sold by the British retailer Marks & Spencer.

[4] According to Marks and Spencer, it takes 38 people to assemble each cake from start to finish, and 8.4 tonnes (8,400 kg) of sugar coating are used each year for the decorative spots.

[6] Colin the Caterpillar has since become a staple of children's birthday parties, but is also popular with teens and adults.

In its complaint, Marks & Spencer claimed that Aldi's Cuthbert the Caterpillar was too similar to the Colin the Caterpillar cake, which could lead consumers to believe that they are of the same standard and allows Cuthbert to "ride on the coat-tails" of the M&S cake's reputation.

[33][34] Emanuel's, a fish and chip shop in East Kilbride, later gained media attention for selling a full-sized Colin the Caterpillar cake that had been deep-fried in batter.