Wood became colonel of the Royal Horse Guards in November 1907, making him one of the most senior officers at Horse Guards during a period of fundamental restructuring and reorganization, and a Gold Stick. He became chairman of the Territorial Force Association for the City of London at the start of 1908. As a qualified barrister since 1874, he had become Honorary Colonel of the 14th Middlesex (Inns of Court) Rifle Volunteer Corps in November 1899 and supported its incorporation as an officer training unit in the new Territorial Force in 1908. On 11 March 1911 he was appointed Constable of the Tower of London. He was a governor of Gresham's School from 1899 to 1919.