Extreme Apprentices: Slum Survivors

Lagos is a city that's car crazy - everyone's obsessed with driving, it's a status symbol even in the slum areas and the roads are packed and potholed. But in this fast growing African nation they're still mainly driving battered second hand cars imported from Europe and kept on the road by thousands of skilled and resourceful tradesmen. Can 3 budding UK car mechanics cut it with the best?