Monica, have you tried the British Embassy Archives. I am sure that there was an Embassy there at the time, or a consulate general. National Archives covered by the BBC.; wasnt around that time that we had to get out of China. China themselves may well have a list of aliens living in China at that time, but whether they would allow you access to them is another matter. And again, we had to leave more recently from Hong Kong (Christopher Patton was it) when the treaty came to an end.
Definately the British Government would have some details or point you in the right direction.
Has anyone got a link to the national archives.
marcie