Running between Plumstead station and Lower Marsh, it is operated by Stagecoach London.

[3] The service is the only Transport for London contracted route to serve the section of the A2 road through Blackheath Hill.

[5] In 2015, the route was curtailed to Lambeth North Underground station and only completes the journey to Whitehall at night.

[6][7] When next tendered, it was retained by Stagecoach London with a new contract commencing on 23 July 2016, when it resumed terminating at Horse Guards Parade in Whitehall.

[8][9] On 15 June 2019, the route was permanently withdrawn between Lower Marsh and Whitehall as part of TfL's Central London Buses Review.