Slick-backed 1950s-style rockers from Sheffield (Rockin' Rabble) and a crew of slick estate agents from Surrey (Hot Property)built fully functioning fire engines. Each vehicle would be tested for a race to resuce a stranded doll on second floor of a wooden house, a race to douse the burning barbecue grill, then the race to douse the flame on the wooden house. Rockin' Rabble built on top of a pickup truck with a giant tank and a paddle pump. Hot Property built from a van with a smaller tank and pump. In challenge day, Hot Property won the rescue race, Rockin' Rabble led on barbecue grill event. In third race, Rockin' Rabble's vehicle's pump broke, so the teammates had to use water bucket. Hot Property eventually ran out of water, but not before dousing most of the flame. Hot Property won the third round and the match.

In the second semi-final, three policemen from Hampshire (Cops and Bodgers) and a team from the Royal Navy (Destroyers) built curling machines that can skim full size, wheel-less cars across an ice rink. The winning team would be the one that has its car closest to the centre. Destroyers built a chain driven, motorized pushing arm; Cops and Bodgers built a gravity-driven hammer. In challenge day, the machine from Destroyers was broken, but eventually fixed. Destroyers won.

In the final of the UK tournament, a team of naval engineers from Portsmouth (Destroyers) and a bunch of estate agents from Surrey (Hot Property) built tanks that can pass over the rough terrain and shoot predetermined targets. Destroyers built a 6-wheel drive tank, Hot Property built tread-driven tank. In challenge day, the tank from Destroyers was able to finish the course with a broken turret. Hot Property's tank, however, was high-centred when driving over a uphill slope. The tread failed to push the tank across the slope and the team failed to finish the race.

A team of engineers from Jaguar (The Catalysts) and season 12 champions (Destroyers) built Grand Prix racing cars capable of taking on Britain's fastest circuit. The Catalysts built a car with engine behind the driver, Destroyers built a car with engine in front of the driver. In challenge day, The Catalysts won the race and Grand Final.