The route was first proposed by Transport for London in April 2023 as the first proposed new route in the Superloop network of orbital express bus routes.[1] At the time of the consultation, the route was proposed to be numbered X183.[2][3][4]
The route was renumbered from X183 to SL10 before it was introduced.[5][6][7] Route SL10 was introduced on 25 November 2023.[8][9] It is operated by RATP Dev Transit London as a variation to its route 183 contract that it parallels between Hendon and Harrow.[4]
Current route
Route SL10 operates via these primary locations:[10]