What is the author's style in The Story of English by Robert McCrum?

Robert McCrum, William Cran and Robert MacNeil, the authors of The Story of English, are professional journalists and writers who composed The Story of English to explain the current variations in English in their developments for popular consumption. The Story of English became an international best eller as a result. The authors apologize for not writing a more scholarly book at the outset, and in fact, the authors are not experts in the English language on the whole. Nonetheless, the perspective the authors bring to the book is one of deep admiration for the language.