Off-road supercar battle: Lamborghini's Sterrato rivals Porsche's 911 Dakar

Both car makers - Lamborghini and Porsche - are going head to head with a battle of the off-road supercars. First to release an all-terrain model is Porsche and its 911 Dakar, costing £170k. But it has a new rival - the £270k Lambo with the Sterrato.