Scale 1:48. Drawing shows plan views of the flats, as fitted for the T class submarines Tudor (1942) and Thule (1942). A Devonport Dockyard stamp, dated 21 June 1944 is printed on the drawing. A Devonport Dockyard Pigeon Hole Manager of Constructive Department stamp is also printed on the plan. A Scott's Shipbuilding stamp, dated 7 March 1949 is also printed on the drawing. A Scott's Shipbuilding Principal Ship Overseer's stamp, dated 10 March 1949 is also printed on the plan. A Portsmouth Dockyard Manager of Constructive Department stamp, dated 15 October 1947 is also printed on the plan. An annotation on the drawing states to see fly drawing MCD12235 for alterations to Thule made at Chatham Dockyard in 1946. The plan shows modifications made at Scott's Shipbuilding & Co in Greenock, in burnt sienna ink dated January 1949 during Thule's refit. The maker's signature is in the bottom left corner.