("part of" meaning not independent or "occupied independent") I am especially thinking of European countries.
- British, US and Soviet positions "spreading"?
- Actual situation after 1950?
- Independent judgement of situation an history before 1949?
- Chinese influence?
I do know that no countries have a different official position.
I know the British made their own judgement, but possibly it was influenced by politics (relation to China). AFAIK US was just very supportive of the Chinese (ROC), and did not give Tibet much attention in the beginning. When it became an issue they were bound by their relation to ROC.