Exeter: Garden House aka "Mies van der Rohe Inspired House

Charting the building plans of Peter and Christine Benjamin, who are hoping to construct a small retirement home within a walled garden in the grounds of the Edwardian manor house where they used to live. The proposed property has floor-to-ceiling glass on one side, with a traditional potting shed-style exterior on the other, but Peter's ambition to design as they build causes problems.