I want to know the answer to the following question:
Who imposed the Treaty of Lhasa?
All the background I'm provided with is that "In 1904, a British expedition to Tibet, spurred in part by a fear that Russia was extending its power into Tibet as part of The Great Game, invaded the country, hoping that negotiations with the 13th Dalai Lama would be more effective than with Chinese representatives.". Is that enough to answer the question?
Answer: no