Is, or was, there a booklet/book out there on a detailed history of the Royal Albert Hall organ?
I don't think so, although it was featured in "The Organ" and other journals from time to time. It doesn't have that much history - built by Father Willis 1871-2, rebuilt by Harrison and Harrison 1933 (Great, Swell and Pedal first, the rest delayed through lack of funds), some alterations by H&H 1973-3, refurbished with some recasting by Mander 2001-4. It would be interesting to see other quotes for the job, if they exist, and there is a wealth of stories about the organ and who played it over the years.
Ian Bell and Bill McVicker wrote a pamphlet "The Grand Organ" on the 2004 restoration.