PX212, PX214, and PX219, were converted by the Heston Aircraft Company from Hornet F.1 standard aircraft to represent and test aspects of the initial naval version, later named Sea Hornet F.20.
Outros tres (os PX212, PX214 e PX219) foron convertidos pola Heston Aircraft Company do Hornet F.1 stándar para representar e probar aspectos da primeira versión naval do avión, que posteriormente foi designada Sea Hornet F.20.