Thats why I suggest a navy equipped to defend our shores. Aircraft carriers with their protective screens, for expeditionary work in foreign places, don't protect our shipping lanes, they consume resources better used elsewhere. Like anti-piracy patrolling, anti-submarine warfare, anti-smuggling etc. Oh, and lots of our own submarines for attacking other naval vessels that might interfere with our interests.
The Falklands have a perfectly serviceable airfield for fighters and maritime patrol aircraft and the submarine was a most effective weapon for keeping the Argentinian Navy in port. An aircraft carrier is, on the other hand, as fine a target as anything that sailed the seven seas - as any submariner or Super Etendard pilot will tell you.