If you've ever wondered how police drivers chase bank robbers, then watch Top Gear tonight. William Woollard visits the Metropolitan Police Driver Training School at Hendon, which celebrates its golden jubilee this year. Every day on Britain's roads there are eight accidents between vehicles and horses. Chris Goffey climbs into the saddle to report on new guidelines. And an exclusive look at this year's British Grand Prix - or at least a scaled-down version.