While hugely entertaining, the Top Gear challenges are pretty much 100% scripted. Ever notice how they always reach the destination within moments of each other?...And of course the car wins! (Did it ever lose a challenge? Can't remember if it did. Nor would I want it to ;-))
Actually the footage is edited to make it seem closer. Sometimes it is, and sometimes it aint In the race I mentioned, the car actually beat the train trip by close to an hour.
In other races, the car lost twice. Once to a bicycle, and once to on off shore racing boat.