...it would perhaps therefore be polite/sentient if you cosidered my answer to your question in light of the question you asked.
I take it you mean the question;
what kind of casualty rate do you think this 'oxfam' fleet would take before a set of gucci goretex boots walked on the sand?
Well, in the scenario you have given, with MPA full of Argentinian fast jets, having taken the Islands by force, downed our fast air and SH, torpedoed any RN ships, destroyed the radar sites and holding prisoners any surviving military or other British Citizens, I guess the answer must be...whatever it may take !
As I said earlier, I don't think they would be able to take the Islands in the first place.
As for force strength and disposition, I suggest you ask your editor if these are appropriate questions to be asking