Their task for next week is for each team to design an electric bike. That will be either a good laugh or it'll make you cry. They showed a very quick clip this week. I'm guessing that there were a lot of constraints on their design because it looked like they used Bosch systems and probably standard frames, so the only thing they could do was pick from a list of parts then colour and brand them. It'll be interesting to see how much they can mess that up. 21:00 BBC1 next Wednesday.