Bluebottle wrote:They seem hugely problematic and expensive to produce as mainstream bikes.

Bikes
Trams get stuck because they are trams, not because they are electric.
Buses can carry large bulky objects (gas, cell stacks)
Manufacturing costs would drop but the raw materials wouldn't. Platinum isn't going to get cheaper. As I understand it, a bike needs £1000 of platinum - and that is only one of the noble metals required in the catalyst. Plus you still need the battery and motor from the electric bike.
Manufacturing of the vehicle itself isn't going to change significantly for the Scottish bus if they are already using a production vehicle as a base, only the conversion cost.
I'm not against hydrogen I just don't see how it is going to work.
The hydrogen burgman is supposed to be on its way but as far as I know Suzuki would not allow reviewers to ride fast roads or over long distances.
Could that be because the fuel cell can't charge the battery as fast as it is being depleted?