[3] In February 1907, the first bus produced by British Automobile Development Co. and Brush Electrical Engineering Co. Ltd. went into service on this route.

[4] Tilling-Stevens petrol electric buses were used on route 12, running between Oxford Circus and Peckham.

The western terminal was cut back to Shepherd's Bush on 13 July 1991 and to Notting Hill Gate on 12 March 1994.

[6][8] Free WiFi and passenger information screens were introduced in August 2014 on two buses as part of a trial by Transport for London.

[9][10][11] Wright Eclipse Gemini 2 bodied Volvo B9TL and Wright Eclipse Gemini 2 bodied Volvo B5LH double deck buses were introduced on 24 November 2011 as part of the Mayor of London's policy to withdraw articulated buses from London.