The series and the book are cast as an adventure story, or the biography of English as if it were a living being, covering the history of the language from its modest beginnings around 500 AD as a minor Germanic dialect to its rise as a truly established global language.
In
the television series, Bragg explains the origins and spelling of many
words based on the times in which they were introduced into the growing
language that would eventually become modern English.
English Goes Underground: Bragg discusses how class also affected the use of English, especially in the time of William the Conquerer and for approximately 300 years after his reign; during this period, only the French language and Latin were used in state affairs and by the aristocracy, while English remained in use with the lower peasant classes.