UK 29 April 2015 LISTEN: David Cameron doesn't know how much national debt has increased "I haven't got the figure off the top of my head." Debt trouble. Photo: BBC Sign UpGet the New Statesman\'s Morning Call email. Sign-up During an interview with Jeremy Vine on BBC Radio 2, David Cameron was asked how far the national debt has risen. He was accused of failing to eliminate the deficit, and pushing up the national debt. But rather embarrassingly for the PM, who incessantly criticises Ed Miliband for forgetting to mention the economy, he didn't know: "I haven't got the figure off the top of my head." The answer: over £100bn. Cameron seems to be rather forgetful of late. Recently, he couldn't tell us how much the Living Wage is, giving a very similar excuse: "I don’t have the figures in my head." › The New Statesman's election endorsement: why it has to be Labour I'm a mole, innit. Subscribe For daily analysis & more political coverage from Westminster and beyond subscribe for just £1 per month!