Hi Hannah Don't know if you are still on the system. I am related to Russell's second wife, Hilda Annie Hooper, whom he married in 1939. Brian Farmer contacted me through my web site (www.jearnshaw.me.uk) and has already told me quite a bit.
You may be unaware that you have a lot of "partial" cousins who are descended from Hilda and her first husband.
Would love to learn more. What I know is on my web site.