The Empire Marketing Board (EMB) produced divers <a href=http://allposter.org [allposter.org]>posters</a> concerning billboards. It also produced smaller versions that the public could procure in the interest of 1s 6d, and by 1933 had 27,000 schools on its assignment list. Pro its 1931 ‘Acquire British’ campaign, the EMB printed more than four million posters, right down to microscopic versions in place of motor windscreens, and honoured aviator Amy Johnson’s aircraft flew for London with Obtain British posters plastered to its wings, and more in its belly as trainload