John Gross was one of my two significant early editors, along with Terence Kilmartin of the Observer. he instilled a rule in me, one I still follow in fictional prose as well as journalism and book reviews. Never start consecutive paragraphs with the same word--unless (I add to myself) you begin at least three paragraphs this way and the reader can tell that you're doing it on purpose. John is right. It looks uglily inattentive, clunking against the eye as well as the ear.
This tip I think is obviously true, but I wonder at its mechanical or mathematical nature. Won't there be or isn't there already a program that will scan a piece of writing for style. Image StyleCheck right there with SpellCheck and GrammarCheck. Instead of an anthropomorphized paperclip, a little picture of Joyce pops up: "Are you trying to writing in stream of consciousness?" Ah, the future! Where all our soul-crushing laziness will be realized!