When the Falkland Islands were invaded by Argentina in April 1982, Britain’s immediate response was to send a task force. But behind the pomp and bravado of its departure, a sober reality lurked. A mere 20 Sea Harriers operating from two aircraft carriers would take on the might of the Argentine air force, some 200 planes strong. The MOD estimated that within four days and against such formidable air power, half the harriers would likely be lost.