THE RAJ RECONSIDERED: BRITISH INDIA's INFORMAL EMPIRE AND SPHERES OF INFLUENCE IN ASIA AND AFRICA

This provides a detailed explanation of how the Indian Empire was organised and run. But its main purpose is to argue that the British Indian Empire was in fact much larger than historians of the Raj normally realise because the Empire should be taken to include the Gulf Arab states, Bhutan, Nepal, Afghanistan, the Aden Protectorate and the British Somaliland protectorate.