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The route previously continued north to Potters Bar, and south past Warren Street station to Victoria bus station. However, following the opening of the Victoria line in 1969 it was cut back to its present terminus at Warren Street. The London Transport Executive stated that the opening of the tube line had reduced the number of passengers travelling between Warren Street and Victoria.
Upon being re-tendered, the route was retained by Metroline with a new contract commencing on 5 February 2005.
In June 2018, it was announced that electric buses would be introduced on this route. On 19 August 2019, new Optare MetroDecker EVs manufactured by Optare were introduced.
Contract tendering
On 5 March 2005, a 5-year contract was awarded to Metroline with increased frequencies resulting in an allocation of 31 TPL buses on Monday-Friday, 24 TPL buses on Saturdays and 21 TPL buses on Sundays from Holloway garage.
On 4 February 2012, another 5-year contract was awarded to Metroline.