The Falkland Islands legislative assembly said Baroness Thatcher's "friendship and support" to the territory would be "sorely missed".
Assembly member Mike Summers said: "It is with great sadness that we received news of the death of Baroness Thatcher this morning.
"She will be forever remembered in the Islands for her decisiveness in sending a task force to liberate our home following the Argentine invasion in 1982."
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Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.
Planning on going to the London Marathon tomorrow? Read our handy guide first!