Karol Rathaus was a subject of a recent online article by Dr. Michael Bienert, which can be found at this link  https://michaelbienert.de/karol-rathaus/ 

The article also mentions our film, however the most amazing part of the article is its link to the recording of Rathaus’ String Quartet #3 composed in 1936 in London. The score of this quartet is absent in Rathaus’ archive at Queens College and is believed to be lost during German bombing of London in 1940, when a house contained many of Rathaus’ possessions and manuscript was destroyed.