Mis-filed in the WW1 Service Records (WO 363) - a few pages showing this man's physical description and the exact dates of his marriage & children's births:

Henry David NORTHWOOD (name found using freebmd) of Millwall, London.
Married Mary Ann Elizabeth Wood - Poplar, 1899.
Children: Henry Fred 1899, Walter William 1901, Maud Elizabeth 1903, Lily 1906, Dorothy Jane 1908, Frederick Arthur 1914 & Mary 1916.

Joined the ASC in October 1914. (Regt No is probably 2377 or 2379). Served until at least October 1918.

Anc****y, CLA, pages 205655-205664