The Alexander Dennis Enviro400 is a twin-axle low-floor double-decker bus that was built by the British bus manufacturer Alexander Dennis between 2005 and 2018. It replaced the Alexander ALX400, Dennis Trident and Plaxton President. In 2014, the Enviro400 was succeeded by the updated Alexander Dennis Enviro400 MMC and production of the classic Enviro400 ceased in 2018.
Coastlink liveried second generation Enviro400, operated by First Norfolk and Suffolk in 2020
First generation (left) and second generation (right) Enviro400s of National Express Coventry, photographed in May 2022
The first production Enviro400, Stagecoach 19000 Spirit of London, new in 2005, photographed in 2014
A second generation Enviro400 operated by First Greater Manchester
London Buses route 24 is a Transport for London contracted bus route in London, England. Running between Hampstead Heath and Pimlico, it is operated by Transport UK London Bus.
Abellio London New Routemaster at the Strand
Preserved Grey-Green Alexander bodied Volvo Citybus as used on route 24 from 1988
London General Alexander Dennis Enviro400 at Trafalgar Square in June 2011