If the F-35B failed, would Britain still build Queen Elizabeth as a CATOBAR carrier?
Short answerProbably, if the failure came early enough in design; cost, carrier numbers, and the eventual air group would remain open questions.
NotesCATOBAR options existed during the Queen Elizabeth design process, including the work associated with French participation. If the F-35B failed early enough, Britain would probably adopt catapults and arresting gear. EMALS would make that an expensive choice, but continuing with Harrier was not considered a viable alternative. Whether both carriers survived and which aircraft they operated would depend on why the F-35B failed and the circumstances at the time.