William Gordon Perrin (1874–1931) was an RAF and Navy officer, who also held the position of Admiralty Librarian from 1908 to 1931. Originally published in 1922, British Flags provides a detailed analysis of the uses and development of flags. It is regularly regarded as one of the foremost volumes on flags, setting a benchmark for the studies which followed. The text contains numerous illustrative figures, together with detailed notes and an exhaustive index. This is a highly informative book that will be of value to anyone with an interest in the history of flags, British history and naval history.