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The Task Force in 82 initially had three Type 42s for AAW (Sheffield, Coventry and Glasgow IIRC) and these were deployed in a screen between the carriers and the Islands/Argentine mainland to the west. More type 42s were sent south during the conflict, especially after the loss of Sheffield, and were in theatre before Coventry was lost. As many Frigates as possible were deployed also, though only two type 22s were available (of three in service). Type 42s were teamed up with type 22s and deployed 'up threat' from the task force and were referred to as either a 22/42 combo or a 'Type 64'! The idea was to use the 42s to shoot down incoming raids before they hit San Carlos with Sea Darts, whilst the 22 provided point defence for the ships themselves with Sea Wolf. Effectively they were trying to replicate the capability of the double ended type 43 which had only been cancelled the year before. Coventry was sunk whilst operating as part of a type 64 when she manouvered in front of Brilliant's line of fire and her Sea Wolf system shut down (a safety measure). If the type 42s had had their own point defence system she would more than likely have survived the encounter.

I'd set a level of two AAW escort minimum for a CVSG, with four ASW escorts further out and an SSN or two lurking nearby. A CVSG will usually be followed by a replenishment group which will also require at least one AAW escort and a couple of ASW escorts. Without food, fuel and munitions, the CVSG cannot operate.