City traders are commissioning private exit polls on the results of the EU referendum to try to cash in on movements in the value of the pound. Hedge funds and investment banks hope the surveys - which reportedly cost a basic £500,000 - will give them a head start in betting on sterling as voters cast their ballots on 23 June. They are looking to take advantage of electoral law which allows exit polls on the day of the referendum but forbids them from being published before polls close at 10pm.