Letter Rate 8¢ Package Rate 8¢ Postcard Rate 6¢ Great Britain 2/15/1971 The UK Decimalize Currency The United Kingdom and Ireland decimalized their currency. American President Richard Nixon (1/20/1969-8/9/1974) British Prime Minister Edward Heath (6/19/1970-3/4/1974) German President Gustav Heinemann (7/1/1969-6/30/1974)