The fast jet compliment of CVA01 was 36 aircraft, and because the RN had more Buccaneer than Phantom (assuming the RN gets all 48 they ordered ) they might have 14-16 Phantoms and 20-22 Buccaneers including those permanently configured as tankers. This compares favourably to the 20 Sea Harriers that initially went south in 1982, and the 25 SH and 6 GR3 that the force peaked at on 21 May.
In a broader sense, Britain would have to emphasize her naval commitment to NATO, in particular contributing a strike carrier to NATO strike fleet Strike Group 2 and amphibious capability to the same fleet. They would also likely have to buy the F111k or a large run of Buccaneers and maybe take up the extra Phantom options for the RAF.
Its a massive increase in capability over OTL as each Phantom would carry 4 BVR Sparrow Missiles and 4 Sidewinders vs SHAR1/GR3s 2 Sidewinders and the Phantom had a far greater performance Envelope than SHAR 1/GR3 allowing them to operate further out and for longer than a given Harrier CAP
Also with Buccaneers providing the strike capability this pressure is off the Phantoms allowing them to concentrate purely on providing the fleet CAP
And then there is the is the then AEW capability
As for the configuration of the airgroup - for the South Atlantic mission I would expect the British to cram more aircraft onto this Flattop than they would have carried in peacetime and therefore far more than the 36 peacetime compliment
And that the airwing would bias towards Phantom given the primary mission being one of Fleet CAP with a secondary Strike Capability
So 45 AC - 5 Wessex (Mix of AsW and HC), 6 Gannet AEW, 22 Phantom and 12 Buccaneers