The photo was taken in October 1914, at the training camp near Goring on Thames. The whole group shows a "football team" of men connected to the Chatsworth estate. My grandfather is one of them but I wondered if knowing the rank of this guy would help to identify him. They were probably all in the Notts and Derby Brigade: the Sherwood Rangers, South Notts Hussars and Derbyshire Yeomanry. I expect that the Chatsworth men were mostly Sherwood Rangers or Derbyshire Yeomanry. My grandfather was in the Army Service Corps, and I suppose this gentleman might have been in one of the supporting bits too. Hopefully this will make sense to someone

Added: is it a record of service?