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@Bad_Science
We had a hydrogen fuel cell van when I worked for westminster council. It was shite. It had a massively over-engineered gas tank, to comply with safety regs, so it barely had any space for an actual load. The fuel cell is a clever bit of kit, but it is really just a fancy way of powering an electric motor. You have to expend energy somehow to get your hydrogen, either by burning fuel to run an electrolysis plant, or using wind or solar power. If you're going to go that route, you might as well just charge a battery. With battery tech improving all the time, it seems like a bit of a dead-end for road vehicles.
The company who made our van were called Zevco, who seem to have folded. The blokes I spoke to when they delivered the van seemed to think that the best chance of success for the technology was for marine engines, where the weight of the fuel tanks is less of an issue.