Sustainable improvements in energy efficiency can only be obtained through properly understanding the condition of a building, how it is meant to perform and what effects this performance through condition, use and interventions and this is determined thorough a pathological investigation. A film on building pathology with narration by Edwards Hart Director John Edwards describes a building pathology case study and in another film on the same case study he describes very specialist energy performance tests. In order to find out more about the Heritage Cottage case study click here.