Have a look at the HMS Dauntless diagram at my site, seems like this thing could shoot down any plane as soon as it leaves the tarmac.
I think the worst the Argentines would pull would be a blockade... it is doubtful they have any amphibious capability left, agreed. But the English are re-enforcing the area for a reason...
The Dauntless will not venture that close to the Argentine shore. They would have to closer than 70 mile sor so to the base launching the aircraft where they would be subject to much, much more danger.
The Dauntless would position itself somewhere between the islands and the mainland on whatever the principle threat axis was.
She is very good, but with a loadout of only 48 missiles, alone she would be subject to a saturation attack if the Argentines were willing to risk it...which they wont.
The UK has four or five Eurofighter Typhoons on the Island at all tims now, but should send in at least one full squadron to reinforce them if there is a crisis so they had upwards of 18.
Amnyhow. here’s a good site about the Type 45 Daring Class Destroyers
http://www.jeffhead.com/aegisvesselsoftheworld/daring.htm