The 800th birthday of Magna Carta was only lightly celebrated in Hong Kong, where mental energy is generally directed to the future rather than the past. A brief appearance in the Eastern Court last month by a certain Donald Tsang, however, suggests that Magna Carta remains a steadfast force in the former British colony. Tsang, a former Chief Executive of Hong Kong, was charged with two counts of abuse of public office. The charges were instigated by the Independent Commission Against Corruption, which began its investigations while he was still in office. The Beijing-appointed head of the Special Administrative Region…