In the early 80’s the Argentine military was highly politicized. Promotion was based on family connections and proven ideological committement to the current regime.
The Argentine military of today is much more professional.
Not to Western standards but enough to win a war off its shore against a country fighting half way around it.
Would the British public be willing to pour blood and treasure there ?
I doubt it. Argentines are quite manic about a few rocks in the South Atantic.
There's lots of treasure there.
http://www.le.ac.uk/geology/art/gl209/lecture4/lecture4.html
After untold millions spent, four fine warships sunk, and several hundred deaths, so are we.