Number 1 Lincoln Machine was rebuilt with an extended (90 centimetres longer) track up to 6 December 1915, but merely to test the new tracks in Burton Park, near Lincoln; the second prototype was seen as much more promising. The first was renamed Little Willie, the scabrous name then commonly used by the British yellow press to mock the German Imperial Crown Prince Wilhelm; Mother was for a time known as Big Willie, after his father Emperor Wilhelm II of Germany. That same year the cartoonist William Kerridge Haselden had made a popular comic anti-German propaganda movie: "The Adventures of Big and Little Willie". Although Little Willie was demonstrated alongside Mother in January 1916, it was by then peripheral to the development of British tanks.