The new scale of 000 was invented by Lone Star as a commmercial venture... As well as the usual trackside accessories - signal box, station platform, bridges - Lone Star offered a range of scale buildings, the Gulliver County series, from 1963 onwards. There was also a set of tiny vehicles, consisting of a Citroen DS, a Land Rover, a single deck school bus, a fire engine and an Austin articulated flat truck. The accuracy of these is remarkable in spite of the minute dimensions of this series (the Land Rover is only 30mm long.)

(From the book Lonestar, The Toy Company and Its Model Cars, by Andrew Ralston)