When the Conservatives were returned to office at the 1979 general election, Ridley was appointed to the new Conservative government as Minister of State at the Foreign and Commonwealth Office. In this position he was assigned responsibility for policy concerning the Falkland Islands, a position in which according to Patrick Cosgrave, he did not acquit himself well and "seriously misread the intentions of the Argentinian government". His first visit to the Islands was in July 1979, after which the Foreign Office considered the options, given that the idea of 'Fortress Falklands' was deemed unfeasible on the grounds of cost – Britain could not afford to maintain a sufficiently powerful military presence on the Islands to deter an invasion.