Green Line is a long standing commuter coach brand in the Home counties of England.

These services were largely started in response to the emergence of numerous small independent operators, often running single routes.

Patronage was declining, partly as a result of increasing car use and quicker parallel rail services, and the last cross-London routes ceased in 1979.

[12] They were sold separately, and ownership of the Green Line network became fragmented, with only a few routes surviving.

On the same day, route 703 was introduced under the Green Line brand, running between Heathrow Terminal 5 and Bracknell, replacing the withdrawn section.

[17] In April 2020, Arriva Herts & Essex was scheduled to commence operating a new Green Line route 720 from Stansted Airport to Liverpool Street, but was delayed due to the COVID-19 pandemic.

[18] On 4 December 2021, route 758, operated by Arriva Herts & Essex, was withdrawn, citing long-term low passenger numbers made worse by the COVID-19 pandemic.