The Dengineers S04E10 - Cycling Den

Joe and Lauren get the help of experts to design dream dens for children. 9-year-old Campbell loves cycling and uses rollers to train at home, but there isn't much room and he has to move the sofa to put the rollers down. His mum and dad are getting fed up of the oil he gets everywhere. Campbell needs a cycling den where he can cycle all over the world without getting oil on his parents' sofa!