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.
Articulated buses in the United Kingdom
Articulated buses were rarely used in the United Kingdom compared to other countries, until the turn of the millennium. This was historically due to the UK preference for the double-decker bus for use on high capacity routes. As of June 2006, there were over 500 articulated buses in the UK, although they are still heavily outnumbered by double deckers. The majority of this fleet was used in London, although in August 2008 it was announced these buses would be withdrawn by end of 2011.