(FILES) In a file picture taken on September 10, 2013 a picture shows a sample ten pound British polymer banknote sitting on top of normal circulation
(FILES) In a file picture taken on September 10, 2013 a picture shows a sample ten pound British polymer banknote sitting on top of normal circulation cotton paper ten pound notes during a news conference at the Bank of England in London. (CHRIS RATCLIFFE/AFP/Getty Images)