After walking around in and on the grounds taking photos of the "lake" we visited where she was buried in Golder's Green. Got more than we bargained for since the funeral director, a young and enthusiastic professional took us on a tour of the crematorium! More than I wanted to know.
He told us about some of the other famous people who are buried there. I think I remember something about her ashes being returned to Russia but I think in the end it didn't happen.