The launch of the new Series F banknotes was announced on 29 October 2006 by the Governor of the Bank of England. The first of these new notes, a £20 note, features the Scottish economist Adam Smith, the first Scot to appear on an English note. (The first non-Englishman, Anglo-Irish Field Marshal Arthur Wellesley, Duke of Wellington, appeared on the Series D £5 in 1971.) Smith also features on £50 notes issued by the Clydesdale Bank. Previous issues of Bank of England £20 notes were known to have suffered from a higher incidence of counterfeiting (276,000 out of 290,000 cases detected in 2007) than any other denomination. The note, which also includes enhanced security features, entered circulation on 13 March 2007.