If you are wondering how we will all get around once the oil wells run dry, you might take comfort from Ford's latest hydrogen fuel-cell electric Focus. It goes into limited service with commercial fleets in 2004. It currently exists as a one-off prototype valued at about £2.65 million but while its price might make an insurance broker blush, its performance won't have the same effect. It has the kind of urge usually associated with a 2.5-litre Mondeo and its refinement is surprisingly convincing. Appearing at this year's Challenge Bibendum, an event described by organiser Michelin as "a rolling roadshow...