Featherstone (who sometimes used his middle initial and sometimes didn't) served in the Royal Armoured Corps in World War II before becoming a physiotherapist. He worked for Southampton Football Club and Hampshire County Cricket Club, writing books on sporting, dancing, and industrial injuries.
Later, he turned his attention to his childhood hobby of toy soldiers, writing dozens of books on the subject and becoming instrumental in the development of wargaming as a pasttime. He also wrote books on military history.