Watch Scrapheap Challenge online: Episode 13 Series 7 Award show

The Challenge After winning a thrilling final, The Anoraks get their chance to take on the mighty Cat-alysts in this Grand final build. They get 20 hours' build time to construct massive machines capable of hauling tons of timber. In this weighty duel, the Grand final winners will be the ones who pull the most logs. The Anoraks With their captain Geoff Turtell absent on paternity leave, Marc Draper takes the armband and is helped by Lyndon Camidge along with Andy Cross, an old school friend of Lyndon's who comes in as a substitute. Andy is a plant fitter and HGV mechanics expert. All four-wheel-drive fanatics, they've had an amazing run of success in this year's series. Beating a team of firemen in their opening Sand Racers challenge, they went on ton win the Power Rowers and Flame Flingers challenges to reach the final. There, they took on the Hairy Hogs and won in Chariots to reach the Grand final. Helping them to try and go all the way is Mark Haile. A lorry engineer by trade, he repairs, maintains and builds them from scratch. What he doesn't know about trucks isn't worth knowing. Cat-alysts Captain Garry Preece, Shane Brading and Tim Wright make up the now legendary Cat-alysts. Jaguar engineers by trade, they are THE team to beat. They have never lost a challenge in the history of Scrapheap. Winning their first final three years ago, they went on to take their first Grand final success with a remote-controlled car. Wiping out the Barley Pickers with a Car Flinger the following year, they capped it all by winning last year's Grand Prix at Rockingham. Helping them to try to extend their extraordinary run is Richard Vincent, a true West Country character and all-round mechanical genius. He builds tractors, steam engines and dragsters in his workshop in deepest, darkest Somerset. The judge Casting his experienced eye over this heavyweight duel is Neal Davis, the chairman of the British Power Pulling association and a long-time friend of the show. By day he is a health and safety expert in a pork pie factory which he says gives him more time to go power pulling. He built his first model steamroller when he was 10 and hasn't looked back since. He has raced dragsters and built the UK's first jet-powered mini-puller, so he should know what he's talking about.

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