Why did Argentine Type 42 destroyers carry anti-ship missiles when Royal Navy Type 42s did not?
Short answerBritain procured a tightly costed air-defense ship, whereas Argentina deliberately added Exocet to create a multipurpose destroyer.
NotesCost explains the different anti-ship armament of British and Argentine Type 42 destroyers. The Royal Navy obtained Type 42 as a relatively inexpensive air-defense ship after cancellation of the CVA-01 carriers and most of the associated Type 82 programme. What began as the cheaper option became the air-defense destroyer Britain actually procured. Argentina added Exocet because the same hull offered an affordable basis for a multipurpose destroyer.