They are using three hydrogen fuelled black cabs for the 'lympics but they closed the London refuelling station because it was too close to the 'lympics venues. So the nearest refuelling station is in Swindon a 130 mile round trip.
http://www.swindonadvertiser.co.uk/...co_friendly_taxis_are_delayed_for_90_minutes/
http://www.swindonadvertiser.co.uk/...co_friendly_taxis_are_delayed_for_90_minutes/