Economists say voting to leave the European Union would dramatically increase the U.K.’s chances of heading down that road. As Britons contemplate their place in the 28-nation bloc before June’s referendum, respondents to a Bloomberg survey said the probability of a slump spikes to 40 percent in the event of an “out” vote. Hermes Fund Managers Chief Economist Neil Williams shares his thoughts with Manus Cranny and Anna Edwards on “Countdown.”