Twentieth Century Naval Dockyards Devonport and Portsmouth: Characterisation Project dataset https://portal.medin.org.uk/portal/start.php?tpc=010_0677135d5e9e88144c16769a9ff31f8b The project was designed to increase our overall understanding of the dockyard built environment by telling the national story of twentieth century dockyards and the particular narratives of Devonport and Portsmouth Dockyards, enabling Historic England to focus its resources effectively in managing these historic environments (650 acres at Devonport; 300 acres at Portsmouth). The introduction analyses the historical, political, social, military, industrial, architectural and economic background of Devonport and Portsmouth Dockyards during the twentieth century. 20190425 20120927