Jeremy Clarkson, Richard Hammond and James May go rural as they harness a group of high-tech tractors. The Lamborghini Murcielago LP640 dances with the devil on the test track and Kristin Scott Thomas is the Star in a Reasonably Priced Car.

It's the ultimate test of man against machine - or should that be dog against machine - as the Top Gear team set out on one of their most ambitious and arduous challenges ever. Jeremy Clarkson, James May and Richard Hammond take part in an epic land race starting in the town of Resolute, Northern Canada, finishing 450 miles later at the Magnetic North Pole.