Superbikes
For this week's challenge, the teams must build superbikes, high-speed motorbikes, and race each other around the twisty Scrapheap circuit. If that wasn't enough, they are forbidden from using any original motorcycle parts they find on the 'heap.
The Supermodels, model-making marvels from Bristol, are up against The Rescuers, roadside recovery technicians from Birmingham. The heat is on as the two teams compete in three head-to-head races in the battle to become superbike champions and progress to the next round.
