What is the author's style in Flash for Freedom! by George MacDonald Fraser?

Fraser fashions the novel as a memorial, and because of this, there is no need for changes of perspective between the third person and the first person omniscient, although occasionally for rhetorical purposes, Flashy refers to himself in the third person. Once the dramatic moment passes, he reverts to the first person. Sometimes he slips from past tense narrative to present tense, briefly, for the same reason. Everything is put forth through Flashy's eyes after fermenting in his memory for half a century.