SN18 KUV (No 10988) at Fridwswide Square, Oxford in August 2018. ©Motacilla
The ADL Enviro400 MMC is a low-floor double decker bus produced as an advancement of the earlier Enviro400 model. The bus is available in several body configurations on a selection of different Alexander-Dennis, Scania, Volvo or BYD chassis types. As well as diesel options, the buses are capable of being powered by compressed natural gas, hybrid-electric and fully-electric powertrains. Widely used across the UK, the Enviro400 MMC has proved to be a reliable member of many bus operator fleets.
(Information provided via Wikipedia)