Kevin McCloud meets Cumbrian couple Rob and Ruth, who havebought a 200-year-old former blacking mill and plan to slot inan entirely new, timber-clad structure within its walls,giving the impression that it is peeping out from the originalruins. But the original building is a scheduled monument andHistoric England inform them it is too dangerous to repair,giving them no choice but to painstakingly rebuild the ancientmill around their new structure.