Only if the helicopter is not operational for some reason.
Weather you may say, but 1982 proved that the RN will operate helicopters in more extreme weather than in peacetime.
1 or two Lynx HMA.8 can provide anti-submarine cover. But the 4 Sea Skua missiles that they can carry are a joke. What are these going to do against Argentina’s modified Type 42 Destroyer (with Exocet missiles), or 4 Almirante Brown class destroyers (8 MM 40 Exocet SSM). Even Argentina’s corvettes have better anti-ship capabilities.