Were light fleet carriers on the Royal Navy's radar in 1939?
Short answerYes. HMS Unicorn and the next design iterations show that the Royal Navy was already working through light-carrier concepts in 1939.
NotesThe Royal Navy was already developing light-carrier ideas in 1939. HMS Unicorn was ordered and laid down that year, while planners were considering smaller carriers derived from related work. The war accelerated and reshaped those concepts rather than creating them from nothing. This places later light fleet carriers within a prewar procurement path.