When I wrote the book The London Gunners come to Town, about Hemel Hempstead during the First World War, one important source on the 2nd London Division, later the 47th Division was the book by Alan Maude The 47th (London) Division, 1914-19. It provided useful information on the early days of the war, spent in the St Albans area, and helped me to work out the movement of Major Gordon up to the time of his death - which was noted in the book. It was such an important reference work that I photocopied it, despite its size. Should you want to research this Territorial Division I am delighted to report the complete book is now available in digitised form online.
Thanks to Jeffery for drawing this to my attention.