The move comes just six months after a re-run of the "Go to work on an egg" campaign, fronted by Tony Hancock, was barred from the air waves.

This time, the children's song, "Chick, chick, chick, chick, chicken, lay a little egg for me", has incurred the wrath of the advertising watchdog.

An egg company planned to use the tune, sung by 10-year-olds, to promote its omega 3 eggs.

Even though no children appeared in the advert, the Broadcasting Advertising Clearance Centre ruled that using their voices was outside the television standards code.

Kristoffer Hammer, at the BACC, said that the watchdog, allowed children under some circumstances to feature in egg adverts, but their voices could not be used to "promote" omega 3 eggs, a concept that most children would not be interested in.