By Susie Beever & Nia Dalton Chesil Cliff House in Devon was one of the most famous properties on Grand Designs \- but it’s still not been sold. The doomed project originally started on a budget of £1.8million with the hopes of being completed within 18 months. After 12 years of development hell, the incredible coastal mansion, near Braunton, North Devon, ended up costing owner Edward Short his marriage and reportedly left him in £7m of debt. It featured on the Channel 4 series – which turned 25 on Monday – in October 2019 and was described by viewers as the ‘saddest ever’ episode after the ri…