How do I get a visa to visit Tibet?

It was the Chinese position that a Chinese passport was required for entry into China. These were issued, and the delegation entered China at Hong Kong, using them and spent 3 months in China. For the next leg of the journey to the United States and Britain, the Chinese took the position that they would only issue exit visas on the Chinese passports. However the Tibets managed to get a British consular officer in Nanking to issue a British visa on their Tibetan passports, and, again, a US officer in Hong Kong, thus defeating the efforts of the US State Department and the British Foreign Office to deny use of the Tibetan passports, a small victory for the supposedly unsophisticated Tibetans.