What is the author's style in Octopussy by Ian Fleming?

The language in the dialogue and in the expression of internal thoughts embodies the grammar and vocabulary of upper middle class England. The text is studded with British acronyms and terms, such as HM Customs and Excise, Scotland Yard, and the inevitable references to bonnets and lorries. No attempt is made to explain these terms to the reader, who is assumed to be familiar with them. The intended audience is British, or at least Commonwealth, as the Range Officer in "The Living Daylights", would have said.