In the early evening of 31 March 1982, what may have been the pivotal meeting of Margaret Thatcher’s premiership took  place in her office in the House of Commons. Intelligence reports received in London that day had confirmed that the Argentinians were about to invade the undefended Falkland Islands in the South Atlantic. Britain had no way of stopping the attack. The Prime Minister gathered with the Defence Secretary John Nott and officials. The consensus was that this invasion was all terribly embarrassing and depressing but there was nothing to be done other than