Since the three-door two-staircase New Routemaster rollout is completed and there will be no more purchased by TfL, the legacy of the design lives on as more and more bus operators have gained interest with the Alexander Dennis Enviro400 City.
Hertfordshire bus operator Uno (formerly UniversityBus) which is owned by the University of Hertfordshire has rolled out Enviro400 City buses for routes 614 and 644 branded as Comet Bus.