British nationality (born in India)

This India List thread discusses British nationality status for those born in India.

The Way We Are: An Anglo-Indian Mosaic page 6, chapter "Never Give In" by Moira Breen (2008) indicates that the author’s father, who was born c 1890s in Hyderabad, a Princely State, was deemed to be not British,even though his father had been a clerk in the British Residency in Secunderabad, which was a British cantonment area.