Who is Richard Lovelace Henderson, a.k.a. Dikko from You Only Live Twice and what is their importance?

Richard Lovelace Henderson, a.k.a. Dikko, is part of Her Majesty's Australian Diplomatic Corps, stationed in Japan. He has a loose tongue and uses it freely to give his opinions on people who displease him. He works in intelligence as a go-between with Australia and Britain. Dikko is mainly used in the book to introduce Bond to Tiger.