The Brits retired their Harrier IIs in 2010, and only one of their carriers has not been scrapped. The Illustrious was withdrawn from service last year. Her replacement, the Queen Elizabeth, is not scheduled to be ready until 2016.
Looks to me like the Argentinians have a window of opportunity, and I have heard that they have been making threatening noises. Whatever forces the Brits have in the Falklands better be able to be self-sufficient for several weeks, as reinforcements are likely to be by sea, with no air support. I've heard the UK's SSNs are among the world's best. I hope they have enough in the area to be able to fend off or significantly deplete any Argentine seaborne assault.