Diplomacy: Theory and Practice, 5th ed. – Online updating pages
Chapter 9: Consulates
p. 142: cover for intelligence officers. SIS officer George Philo (novelist ‘Charles Forsyte’) was Consul-General at Hanoi in 1968, at the height of the Vietnam War; see Secret Intelligence updating page and Recommended Reading (Novels by former Diplomats and Intelligence Officers).
Further reading: additions and links
Haynal, George et al, The Consular Function in the 21st Century: A report for Foreign Affairs and International Trade Canada (Munk School of Global Affairs, University of Toronto, March 2013)