"[Chamber of Reflection off of Salad Days]I think it's probably that one. There's no guitar on that song, I've never recorded a song with absolutely no guitar, which is interesting. The idea behind it, well it's a Free Mason reference because before they become Free Mason's they had to go into this room called the Chamber of Reflection where they think about the life they brought with them, the life they've lived up until this point and all their wrong and right doings. And that's basically what I did with this album."
Source : Letter to Sir Norman Bottomley on March 29, 1945. "Bomber Harris: The Story of Marshal of the Royal Air Force Sir Arthur Harris". Book by Dudley Saward, p. 294, 1985.