WI for various reasons both the RAF and RN had their AEW just entering service on April 1st 1982 when the Falklands started? Say two Nimrod AEW3 and one Sea King AEW2 for eg.
Before everyone tells me how impossible this is, I know the Nimrod failed and I know the SK was a result of the Falklands, so don't try to educate me about this. However Nimrod AEW studies started in the 60s, so it's not unreasonable to expect a result by 1982, which in the mid-late 70s was the expected IOC. Also the SK was the result of pre-Falklands Low Altitude Surveilance Task (LAST) studies, which is why it got into service so fast.
The RAF could only mount one long range (Vulcan, Victor MR, Nimrod, Hercules) mission into the Falklands per day, so with maybe 3 planes and not too much loiter time would they even bother trying to give the task force AEW cover? I'd imagine that with a prototype already flying the RN could get perhaps 3 SKs on decks by 1st May, and perhaps a couple more by 21s May for the landings. How much difference would this make? Could the RN station Type 64 combo missile traps west of the islands utilising SK AEW with hover refueling techniques?