Why did Britain not continue the Sea Vixen as a D.3 target drone?
Short answerIt would have been an exceptionally expensive target aircraft built from one of the Fleet Air Arm's less reliable types.
NotesContinuing the Sea Vixen as a D.3 target drone would have been exceptionally expensive. Its poor reliability would compound the difficulty of using it in that role. Cost and reliability are the reasons given for rejecting further use, without a detailed comparison of alternative target aircraft.