When Argentina invaded the Falkland Islands, 30 years ago this week, they got 4,700 square miles of land in the South Atlantic inhabited by British sheep farmers driving Land Rovers on the left. A few days after the Argentinian flag was raised over Government House on April 2, 1982, traffic was redirected to the right, in keeping with Argentina’s rule of the road, and arrows were painted on local roads to mark the new driving side. As this period photo of a Land Rover shows, the locals weren’t amused and kept driving on the left when the Argentines weren’t looking. A little over two months later, a British task force retook the islands and the arrows were removed.
So when the Argentinians came they left directions that the left was wrong and the right was right, the British who were left wanted to go left as they didn't feel it was right to go right. Though thankfully the Argentinians left with their right ways which were wrong leaving the British in the right on the left.