On Jul 22, 10:12*am, wrote:

Also, what happened to the few fuel cell buses which operated on the
25 for a while a few years ago once the gimm ^H^H^H^H trial was over?

IIRC they went back to Mercedes for 'evaluation', and one has now been
donated to the Science Museum/LT Museum (can't remember which). Pretty
short life for such expensive vehicles...