Discover the fascinating history of the UK's 1 pound coin, from its 1983 debut replacing the 1 pound note to its current value and rarity. Learn about the 2016 edition's mintage history and more. Find out what happened to the old pound coins after they were replaced. Explore the top 20 rarest 1 pound coins and discover their unique features and stories. Stay informed with BBC London News for the latest updates on UK currency.