The reverse design incorporated the logo of the Bank of England. In the late 1960s it was decided that future banknotes should feature a British historical figure on the reverse. The first such note was the series D £20 note, first issued in 1970, featuring William Shakespeare. A design for a 10/- note featuring Walter Raleigh on the reverse was approved in 1964, but this was never issued. Instead, in 1969, as part of the process of decimalisation, a new fifty pence coin was introduced as a replacement for the 10/- note. The principal reason for the change was economy: the notes had an average lifetime of about five months whereas coins could last at least fifty years. The series C 10/- notes ceased to be legal tender on 22 November 1970. In the Isle of Man, both the English and Manx 10/- notes continued to be legal tender for 50 pence until 2013. Information taken from Bank of England website.