yeah we get the new carriers and the F35s about 2012/14 i think 
in the meantime we still have 3 invincible class carriers equipped with Harrier GR7, unlike the Sea Harrier essentially a strike plane with no radar. your right, this is a worrying gap in capability. the choice was to build a new set of Sea Harriers or refit the GR7 with radar, both for just 5 years of service, both a big waste of money. the result is that fleet air defense is covered by ship-based missiles and GR7s with AIM9s. good thing we've got decent AEW choppers...
See, that's the crux of the whole problem, right there. For one, Argentina's military is different today, too. They scrapped their CV. They just have land-based planes. However, they've added some FFG's and Corvettes' that carry Exocets', and since the Malvinas'(OOPS, Falklands!) are only 300 miles' offshore, land-based aircraft can hit it anyway. I take it, that the RAF extended the runways' at the Airport there to handle the Typhoons, correct? The one problem that the Argie's had last time, was that they couldn't operate their A-4's or Super-Entendards' from Port Stanley's airfield. It was only big enough to handle Pucara's. From what I've read, the Argentine's haven't really done much to their Air Force since '82, apart from an upgrade to the A-4 fleet.