Geoovah,
As Wrathmonk states, the picture was taken by brazilian pilots while escorting a Tornado flight that had to divert to an air base in Brazil. As the picture show, it supposedly happened in April 1995, and since you were down south a few months before that, I thought it was likely for you to know something. One more thing about the picture: I´ve kept it for the past two years in my "Malvinas file", and as far as I know it was uploaded to the web in early 2010, maybe even before that.
Of course, the description you just gave us, perfectly matches what I´ve learnt over these past years: It´s just a picture taken in a non-agressive fashion... almost a courtesy, I´d say. Had we not taken back our own fighters from Rio Gallegos, I´d bet there would be a similar picture of the VC-10 and the Typhoon pair that had to divert to Punta Arenas some years ago.
I remembered something else of your book´s reading: you mention the russian frighters hired to move the 1435 Flight down to MPA. Those planes also come to my city, every once in a while, specially when the oil industry is booming (like it is right now). Here´s another picture of -I´d guess- one of those shippings:
And here´s another one, with a RAF C-17:
Cheers!!
Christian