Police wait for protestors to appear at a branch of Barclays Bank in Westminster, central London, July 4, 2012. Barclays chief executive Bob Diamond, who quit this week over an interest rate-rigging scandal, will be questioned by British politicians on Wednesday, when he could drag the Bank of England, the government and rival banks deeper into the Libor interest rate affair. REUTERS/Olivia Harris (BRITAIN- BUSINESS POLITICS SOCIETY)