
Advertising slogan originated by the Mather & Crowther agency for the British Egg Marketing Board, and used from 1957. http://www.gotoworkonanegg.com/
Fay Weldon wrote to Nigel Rees in 1981: "I was certainly in charge of copy [at Mather & Crowther] at the time…Who invented it, it would be hard to say. It is perfectly possible, indeed probable, that I put those six particular words together in that particular order but I would not swear to it." (The "Quote…Unquote" Newsletter, July 1992, p. 2).