I am currently reading M.M Kaye's "Shadow of the Moon". I am up to page 195. She has not mentioned Alex Randall's regiment, but his orderly is dressed in khaki. Is Captain Randall with the Guides? The authors husband served in the Guides and was related to Lt. Walter Hamilton. In her other India related novel, "The Far Pavilions" the Guides are prominent through out the entire story.
Hope I am not too far off topic!