The Task Force was being followed daily by an Argentinian military 707 in it's progress South, which became a little bothersome.
When they picked up the same radar signature at nearly the routine time (
first law of stress / navigation, you see what you expect to see ) - a Sea Dart missile was within moments of going, which would have been poor
PR and probably a stopper on the whole escapade, but one officer had the brains to spot the course and civilian airliner timetable...
Source - " 100 Days ", by Admiral Sandy Woodward ( not a word for word quote but you get the gist, if not buy the ------ book )!