Thanks for sharing your photos and battle report.
I ran a convention game years ago, pitting these two against one another – good fun to watch.
I used the Clash of Sabres rules for it.
A couple of SHARs engaged a pair of Mirages, the latter using head-on attack tactics, despite my warnings of the low chance of success against the much better armed SHARs that had all-angle Aim-9L missiles. The Argentine pilots were desperate to get home, and one of them managed to down a Sea Harrier with a "golden BB" shot with his cannons, while the SHARs were unsuccessful in their intercepts – literally a 1 in 100 chance – 10% to hit the SHAR, and 10% for the result to down it.
The pilot became the hero of Argentina upon his return to base (especially since historically, no SHARs were shot down by Argentine pilots during the war).
For a better, though more complicated scenario, I think pitting two pairs of Mirages against a single pair of SHARs would be a better match, if fighting at low altitude, due to the better pilot quality, better missiles, and better aircraft maneuverability for the British.
Argentine pilots' main advantage is their speed.
Separate the two Mirage pairs by a minute or two, one behind the other, and the Argentine fighters have limited fuel endurance.
Love that game mat, by the way.
tries out the expansion roads set.