Mark W wrote:

I think the UK Government should pass a law to make this technology
compulsory for all company cars.

BMW and DaimlerChrysler are already working on Hydrogen and Fuel
Cell power as a viable alternative to existing technologies. BMW
have suggested that they expect to be able to offer such engines
within 5-8 years. It's currently looking like the best alternative
to petrol/diesel engines but it wouldn't be feasible to make it
compulsory just yet.

JOOI, why only for company cars?

I want to punish company car drivers!

Ah so it's nothing to do with concern for the environment, merely jealousy.
Thank you for clearing that up for us