This week, Jason Bradbury challenges the teams to morph two post-war Green Goddess fire engines into machines capable of felling trees and chopping the trunks into logs. The two teams have four days to re-engineer a Green Goddess into a tree-chopping tyrant, and their creations will be tested in a forest on the Welsh borders, with the team that chops the most logs being crowned the winner. The Red Team are again being led by the Prince of Pressure, Steve, with Ed, The Professor, taking the reins of the Blue Team. At the chalk board, Steve outlines the Reds’ plan – they are going to bolt a manoeuvrable circular saw on to the front of the Goddess. To fell the trees the saw will be horizontal, but once the tree is down the saw will then turn to an upright position so that it can chop the trunk into logs.