The competition hots up between rival petrolheads Will Mellor and Kirsten O'Brien. The duo go head to head in one of the world's biggest vehicles, the Terex TR100, a dumper truck the size of a house.

The battleground is the UK's biggest opencast mine at Broken Cross in Scotland. Site manager Colin Slater puts Will and Kirsten through their paces in a mentally and physically demanding training regime. It takes months to master the vital skills needed to drive the 100-tonne dumper truck; Will and Kirsten have just three days.

After a turbulent and exhausting week learning to drive the Terex and living alongside the men who work in the mine, Will and Kirsten go down to the wire in their showdown. Will it be Kirsten or Will that steals victory to prove they're the better driver? Show less