M&S Colin the Caterpillar Rainbow - 150g

Colin is the Marks & Spencer caterpillar, the chocolate birthday cake that turned an insect into a national treasure. He is famous enough that M&S once went to court over a lookalike. The Rainbow sweets take the name off the cake plate and into the sweet aisle.

People in Canada go looking for Colin because M&S food is one of those things you only realise you miss once you have moved. You cannot nip into an M&S on the way home any more, so a bag of Colin is a small, cheerful bit of the high street turning up at your door.

It comes in a 150g bag, which keeps happily in the cupboard if you keep it somewhere cool and dry and close it up between raids. It goes into lunchboxes, film nights and long drives, and very often straight into whoever opened it first.

Most people who pick up Colin end up wandering the rest of the sweet shelf: something else from M&S, a bag of whatever they ate on the bus home from school, and one more to post to a sister in Calgary.