This is not a complete list, but it provides a starting point for those with an interest in the British consular service.
D. C. M. Platt, The Cinderella Service: British Consuls since 1825 (London: Longman, 1971).
P. D. Coates, The China Consuls: British Consular Officers, 1843-1943 (Hong Kong: Oxford University Press, 1988).
Lucia Patrizio Gunning, The British Consular Service in the Aegean and the Collection of Antiquities for the British Museum (Farnham: Ashgate, 2009).