I suspect they’re referring to the 99 year lease the UK signed in 1898 with the Qing dynasty. [https://en.m.wikipedia.org/wiki/Sino-British_Joint_Declaration ht

I suspect they’re referring to the 99 year lease the UK signed in 1898 with the Qing dynasty. [https://en.m.wikipedia.org/wiki/Sino-British_Joint_Declaration https://en.m.wikipedia.org/wiki/Sino-British_Joint_Declarati...] As to how they think that has anything to do with their points, it doesn’t of course - and the UK agreed, which is why they left. Also, because it’s not like the UK had any other choice.