Britain's Barclays bank on Thursday said industry veteran David Walker would become its new chairman from November, succeeding Marcus Agius who resigned over the Libor rate-rigging scandal. Barclays said in a statement that "Sir David Walker has been appointed as a non-executive director of Barclays with effect from 1 September 2012 and will succeed Marcus Agius as chairman of Barclays with effect from 1 November 2012."