Double-decker bus
The first commercial horse-drawn double-decker omnibuses were introduced in England in 1847 by Adams & Co. of Fairfield, Bow, then improved upon by John Greenwood, who introduced a new double-decker in 1852.
Guy Motors
Growing populations in towns and cities meant larger capacity buses were a necessity, leading Guy to develop a 6-wheeled version of their dropped-frame chassis which allowed for the introduction of the first 6-wheeled double decker buses and 6 wheeled trolleybuses in 1926. Guy double decker buses and trolleybuses would prove popular with a fleet of double deckers sold to the London Public Omnibus Company and exports supplied all around the world. Exports served as a major source of income for Guy with sales to South Africa, Pakistan, India and the Netherlands, their armoured vehicles proving particularly popular for covering difficult terrain with 100 supplied to the Indian government in 1928.