Tonight, Kevin McCloud follows former blacksmith Alan Dawson. Despite having no architectural training, Dawson has invented his own revolutionary way of building a house - by an assembly that is akin to a giant Meccano set. Eat your heart out, James May. Alan makes the house in pieces in his workshop; with wiring, lighting, plumbing, and even carpets built into the sections which are then taken to site by lorry for construction. Within seven days the house will be up, and a few weeks later he'll be ready to move his family in. Or so he hopes.