My parents first laid eyes on each other 70 years ago today in the most improbable place. They were among a handful of British diplomats invited to tea with the alluring Mme Chiang Kai-shek and her husband, China's leader. The tea party took place at Huangshan, the Chiangs' mountain estate outside Chungking. October 31 was, as it happened, the Generalissimo's birthday. But Max and Audrey would remember the occasion for another reason.