Go to an Irish pub and you’re likely to see one of Guinness’ more famous — and curious — advertising characters: a toucan toting a beer on its beak. But toucans reside in the treetops ...

Gilroy made a drawing of the toucan balancing glasses of the black stuff on its massive black-and-white beak. Ms Sayers wrote the memorable copy: “If he can say as you can ‘Guinness is good ...