Nell is the older Woodbridge sister living in England who didn’t go to Japan with the rest of the family in 1914. She is writing to her sister Floss who was, by that time, in Canada.

I didn’t know when the blackout was implemented during the war in England, but according to Wikipedia, “Blackout regulations were imposed on 1 September 1939, before the declaration of war”. Although the letter isn’t dated, it’s likely that it was written in the 1940s, rather than during 1939.

Another interesting point about the Blackout learned from Wikipedia just now: “In actual warfare, according to M. R. D. Foot, blackouts do not impair navigation by bombers because navigators focused more on reflected bodies of water, railroad tracks, or large highways. The chief purpose is to mobilize the entire civilian population, and provide a test to make sure they are obeying the rules.”