In message , Nick Finnigan
writes

(I noticed in passing the Citaro fuel-cell buses seem
to have been withdrawn from use).

Must have been a short withdraw as I saw one of them two days ago in
service and rode on one of them today at Cobham (two were in
attendance).
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)