[2] It was operated by the London General Omnibus Company as a feeder service to the Charing Cross, Euston & Hampstead Railway which at that time terminated at Golders Green.

[3] Route 84 used to reach further into London: in 1936 it ran from St Albans to Golders Green, albeit omitting Potters Bar itself by running via New Road.

As a wartime economy, from May 1940, route 84 was withdrawn south of Whetstone, being diverted to Arnos Grove station instead.

[7][8][9][10][11] However, after a petition of over 6000 and local protests, Sullivan Buses declared that they would operate a new route between Potters Bar and St Albans with financial support from Hertfordshire County Council.

[2][12][13] The route number was subsequently confirmed to be remaining the same, although with the Potters Bar to Barnet section withdrawn.