Fred and Saffron build a home in the Peak District on a 30 degree slope, with the top floor in plain sight and two post-industrial style floors buried into the thick limestone below

Ten years in the making, this is the longest running Grand Designs ever. In 2007, Ed and Rowena Waghorn started to build a handcrafted five bedroom house on an eight acre smallholding in Herefordshire. Their budget was just £100k. Made from individually carved wooden beams and walls of straw and clay, the heart of the house was to be a huge medieval style hall, complete with massive stone fireplace and a glorious cathedral-like window with panoramic views across the valley. Ed decided to do most of the work himself. Progress was slow. Four years in, the house was still a shell. In 2012 Kevin McCloud decided to follow the build for another five years. In the end, it's just possible this house might turn out to be a masterpiece.