The W&ER had planned an extension of the Edgware, Highgate and London Railway to Watford Junction via Bushey, but it had never raised the capital required and its powers to construct a line had expired in 1911.

Bushey Heath station was to be located on the east side of the roundabout junction of Watford By-pass (A41) and Elstree Road (A411).

[11] The LPTB planned to purchase the land on all four sides of the junction and proposed an extensive commercial development around the roundabout including a cinema, roadhouse and around 40 shops.

[14] Following the outbreak of war in Europe, work on the extension was suspended in September 1939 and was formally terminated in December of the same year as wartime funding restrictions would prevent completion.

[16] Work on designs for the station continued during the war to make changes required to account for Ministry of Transport plans to modify the roundabout to include an underpass.

[18] During the war, the depot buildings were used for the construction of Halifax bombers and the land owned by London Underground at Bushey was used for farming.

As a result of the breakup of London Transport Buses and the devolving of maintenance functions to the depots of individual bus companies, the overhaul works ceased operation in 1986.