Great stuff and perfectly edited, thanks! I honestly didn't know what Bei Dou was, I had just assumed it was a unique but less famous cultivar.
There are some great stories about Bei Dou out there on the web, but I can't find the ones I am looking for now
TeaSpring have a precis of it
A little bit on the history of Beidou No. 1:
In the early 1950s, Mr. Yao Yue Ming started a Da Hong Pao research laboratory. Using a few stems from the original 800 years old Da Hong Pao tea bushes, he successfully created two new tea varieties. However, Mr. Yao's laboratory was later closed down and his research was destroyed during the Chinese Cultural Revolution. Yet, he continued his research in secrecy and through his dedication and determination; he finally perfected his creation. He named this tea, Beidou No. 1.
Other sites tell of quotes from Yao's diary and interviews with his widow.
He secretly took cuttings from the original DHP bushes and many other prized cultivars, many of his cuttings failed to produce good bushes, but he had several successes. I cannot find if Qu Shi and Qi Dan were his products or not.