Horizon’s H-racer hydrogen car is the ultimate executive gadget that will set you back a crisp £50 note to prove your green credentials to the rest of the office. Once you’ve filled the fuelling station with water and turned it on it takes about a minute to fill the small gas chamber with enough hydrogen to power the car - with blue strobe lights it looks pretty cool too. Good, but only for those with money to burn like the petrol they put in there not so green car.

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