RAF Coastal Command planes from mid-1941 wore Temperate Sea Scheme with Sky “Type S” (and later White) undersurfaces. The same scheme was also widely used by RN FAA planes from the beginning of war.
HTK-C140 – BS Extra Dark Sea Grey – Used for upper surfaces in Temperate Sea Scheme. From 1944 overall colour of upper surfaces of RAF CC aircraft
HTK-C202 – BS Dark Slate Grey – Used for upper surfaces in Temperate Sea Scheme of RAF Coastal Command and RN Fleet Air Arm planes
HTK-C026 – Sky “Type S” – Commonly used (from mid/late-1940) for lower surfaces of RAF CC and RN FAA aircraft in Temperate Sea Scheme