Sadly this would be the best time for the Argentinians to muck about. For one, I think that the leadership today is nowhere as strong as that under the Iron Lady. Secondly, while the weapons may be more lethal pound for pound (and obviously more technologically evolved), they simply do not have the logistics, the numbers or the efficacy of going halfway around the world as they once did. The UK has seriously cannibalized their military, and all the Argentines need to ensure is that the mistakes they made last time (some logistical errors, as well as some weapons being duds ...e.g. all those weapons that hit but failed to explode) are not present this time round.
The UK would not be able to do what they did then. For comparison purposes, France still could (both in terms of ability, and more importantly will). Great ....I mean Gelded Britain ...has truly lost its cajones!
The vaunted US military hasn’t managed to win a war in Afghanistan (which is half way round the world) either.